Breakdown of Included Items
JEGS 555-631250 [Disc/Disc] Electric Brake Booster and Master Cylinder Combo has a beautiful polished aluminum finish and is the perfect solution for vehicles with low engine vacuum, such as engines with large lift camshafts or boosted engines with turbos or superchargers. Its versatile and compact booster design measures 7 in. L x 5 in. W x 8 in. H and allows you to mount it almost anywhere. Our combo is the perfect upgrade for classics, muscle cars, street rods, and other vehicles where limited space is an issue.
The integral relay & pressure switch comes pre-wired, requiring only a ground, 12-volt battery connection, and keyed ignition connection. Its whisper-quiet power booster unit draws only 14 amps at max pressure and is quieter than most performance electric fuel pumps.
We designed our system for the do-it-yourselfer with performance and safety in mind. We use a 1 3/16 in. bore master cylinder to provide plenty of fluid for even the most complex braking systems with multi-piston calipers while still creating 1600-1800 psi brake line pressure during regular operation and over 2000 psi at maximum output.
The booster circuit incorporates a hydraulic accumulator ball which works like a capacitor does in an electrical circuit. This ball stores up pressure that allows for a very smooth actuation of the brakes and provides additional reserve pressure to assist the brakes in the event of a failure of the vehicle's electrical system. The built-in safety reserve will give you 10-15 full-assist stops before the pedal slowly starts to get firm as the pressure drops in the boost circuit. If you get to zero pressure in the booster circuit, you will then have manual brakes.
This Electric Brake Booster and Master Cylinder Combo meet O.E.M. (Original Equipment Manufacturer) standards and we recommend using DOT5 silicone-based brake fluid. If you are adding this to an existing system, DOT3 or DOT4 brake fluid will work fine.
Electric Brake Booster and Master Cylinder Combo Features:Special Note: Using the correct type of lines and connections for this system is very important for safety and reliable performance. A high-pressure brake hose with crimped-on fittings with a 3,000 PSI pressure rating or higher is required for the line that attaches from the master cylinder to the booster port. The fluid return line is a non-pressurized line that requires a brake fluid-compliant hose with attaching clamps (Included in this system).
From the iconic mail order catalog to a fully-stocked digital commerce experience, we have built a preferred destination for every gear-head, professional racer, weekend warrior and restoration nut who wants to take their vehicle to the next level.
Around here, we don't just sell parts - we rely on them when driving our own cars around racetracks, dirt trails, and interstates across the country. Parts may be our business - but grease, fuel, exhaust, power, and speed are what we live for.
Today, more than 350 people are employed by JEGS and the business draws in hundreds of thousands of customers each year. Yet, we maintain the culture stared by Jeg Coughlin from the very beginning: a family-run performance shop that preserves a trusted relationship with each and every customer.
From the iconic mail order catalog to a fully-stocked digital commerce experience, we have built a preferred destination for every gear-head, professional racer, weekend warrior and restoration nut who wants to take their vehicle to the next level.
Around here, we don't just sell parts - we rely on them when driving our own cars around racetracks, dirt trails, and interstates across the country. Parts may be our business - but grease, fuel, exhaust, power, and speed are what we live for.
Today, more than 350 people are employed by JEGS and the business draws in hundreds of thousands of customers each year. Yet, we maintain the culture stared by Jeg Coughlin from the very beginning: a family-run performance shop that preserves a trusted relationship with each and every customer.
From the iconic mail order catalog to a fully-stocked digital commerce experience, we have built a preferred destination for every gear-head, professional racer, weekend warrior and restoration nut who wants to take their vehicle to the next level.
Around here, we don't just sell parts - we rely on them when driving our own cars around racetracks, dirt trails, and interstates across the country. Parts may be our business - but grease, fuel, exhaust, power, and speed are what we live for.
Today, more than 350 people are employed by JEGS and the business draws in hundreds of thousands of customers each year. Yet, we maintain the culture stared by Jeg Coughlin from the very beginning: a family-run performance shop that preserves a trusted relationship with each and every customer.
From the iconic mail order catalog to a fully-stocked digital commerce experience, we have built a preferred destination for every gear-head, professional racer, weekend warrior and restoration nut who wants to take their vehicle to the next level.
Around here, we don't just sell parts - we rely on them when driving our own cars around racetracks, dirt trails, and interstates across the country. Parts may be our business - but grease, fuel, exhaust, power, and speed are what we live for.
Today, more than 350 people are employed by JEGS and the business draws in hundreds of thousands of customers each year. Yet, we maintain the culture stared by Jeg Coughlin from the very beginning: a family-run performance shop that preserves a trusted relationship with each and every customer.
From the iconic mail order catalog to a fully-stocked digital commerce experience, we have built a preferred destination for every gear-head, professional racer, weekend warrior and restoration nut who wants to take their vehicle to the next level.
Around here, we don't just sell parts - we rely on them when driving our own cars around racetracks, dirt trails, and interstates across the country. Parts may be our business - but grease, fuel, exhaust, power, and speed are what we live for.
Today, more than 350 people are employed by JEGS and the business draws in hundreds of thousands of customers each year. Yet, we maintain the culture stared by Jeg Coughlin from the very beginning: a family-run performance shop that preserves a trusted relationship with each and every customer.
From the iconic mail order catalog to a fully-stocked digital commerce experience, we have built a preferred destination for every gear-head, professional racer, weekend warrior and restoration nut who wants to take their vehicle to the next level.
Around here, we don't just sell parts - we rely on them when driving our own cars around racetracks, dirt trails, and interstates across the country. Parts may be our business - but grease, fuel, exhaust, power, and speed are what we live for.
Today, more than 350 people are employed by JEGS and the business draws in hundreds of thousands of customers each year. Yet, we maintain the culture stared by Jeg Coughlin from the very beginning: a family-run performance shop that preserves a trusted relationship with each and every customer.
From the iconic mail order catalog to a fully-stocked digital commerce experience, we have built a preferred destination for every gear-head, professional racer, weekend warrior and restoration nut who wants to take their vehicle to the next level.
Around here, we don't just sell parts - we rely on them when driving our own cars around racetracks, dirt trails, and interstates across the country. Parts may be our business - but grease, fuel, exhaust, power, and speed are what we live for.
Today, more than 350 people are employed by JEGS and the business draws in hundreds of thousands of customers each year. Yet, we maintain the culture stared by Jeg Coughlin from the very beginning: a family-run performance shop that preserves a trusted relationship with each and every customer.
PAYMENT
We accept the following forms of payment:
- PayPal
- VISA
- Discover
- MasterCard
- American Express
SHIPPING
Standard shipping is 1-5 business day delivery on most items.
Additional delivery days may apply in some instances, such as hazardous items, mounted tires and wheels, oversized items, truck freight items, select zip codes, Global Shipping Program and remote delivery areas.
SALES TAX
Taxes may be applicable at checkout
RETURN POLICY
If you are not completely satisfied, return the new/unused item in the original box pre-paid (customer is responsible for shipping cost) postmarked within 90 days of purchase, with a copy of the invoice, for a refund/exchange. Once a return has been approved, the credit will be processed within 2 days to original form of payment. A 15% restocking fee will be deducted from any item returned more than 90 days after the ship date. A 15% reboxing fee will be deducted for any item not returned in its original packaging.
PAYMENT
We accept the following forms of payment:
- PayPal
- VISA
- Discover
- MasterCard
- American Express
SHIPPING
Standard shipping is 1-5 business day delivery on most items.
Additional delivery days may apply in some instances, such as hazardous items, mounted tires and wheels, oversized items, truck freight items, select zip codes, Global Shipping Program and remote delivery areas.
SALES TAX
Taxes may be applicable at checkout
RETURN POLICY
If you are not completely satisfied, return the new/unused item in the original box pre-paid (customer is responsible for shipping cost) postmarked within 90 days of purchase, with a copy of the invoice, for a refund/exchange. Once a return has been approved, the credit will be processed within 2 days to original form of payment. A 15% restocking fee will be deducted from any item returned more than 90 days after the ship date. A 15% reboxing fee will be deducted for any item not returned in its original packaging.
PAYMENT
We accept the following forms of payment:
- PayPal
- VISA
- Discover
- MasterCard
- American Express
SALES TAX
Taxes may be applicable at checkout
SHIPPING
Standard shipping is 1-5 business day delivery on most items.
Additional delivery days may apply in some instances, such as hazardous items, mounted tires and wheels, oversized items, truck freight items, select zip codes, Global Shipping Program and remote delivery areas.
RETURN POLICY
If you are not completely satisfied, return the new/unused item in the original box pre-paid (customer is responsible for shipping cost) postmarked within 90 days of purchase, with a copy of the invoice, for a refund/exchange. Once a return has been approved, the credit will be processed within 2 days to original form of payment. A 15% restocking fee will be deducted from any item returned more than 90 days after the ship date. A 15% reboxing fee will be deducted for any item not returned in its original packaging.
PAYMENT
We accept the following forms of payment:
- PayPal
- VISA
- Discover
- MasterCard
- American Express
SALES TAX
Taxes may be applicable at checkout
SHIPPING
Standard shipping is 1-5 business day delivery on most items.
Additional delivery days may apply in some instances, such as hazardous items, mounted tires and wheels, oversized items, truck freight items, select zip codes, Global Shipping Program and remote delivery areas.
RETURN POLICY
If you are not completely satisfied, return the new/unused item in the original box pre-paid (customer is responsible for shipping cost) postmarked within 90 days of purchase, with a copy of the invoice, for a refund/exchange. Once a return has been approved, the credit will be processed within 2 days to original form of payment. A 15% restocking fee will be deducted from any item returned more than 90 days after the ship date. A 15% reboxing fee will be deducted for any item not returned in its original packaging.
PAYMENT
We accept the following forms of payment:
- PayPal
- VISA
- Discover
- MasterCard
- American Express
SHIPPING
Standard shipping is 1-5 business day delivery on most items.
Additional delivery days may apply in some instances, such as hazardous items, mounted tires and wheels, oversized items, truck freight items, select zip codes, Global Shipping Program and remote delivery areas.
SALES TAX
Taxes may be applicable at checkout
RETURN POLICY
If you are not completely satisfied, return the new/unused item in the original box pre-paid (customer is responsible for shipping cost) postmarked within 90 days of purchase, with a copy of the invoice, for a refund/exchange. Once a return has been approved, the credit will be processed within 2 days to original form of payment. A 15% restocking fee will be deducted from any item returned more than 90 days after the ship date. A 15% reboxing fee will be deducted for any item not returned in its original packaging.
PAYMENT
We accept the following forms of payment:
- PayPal
- VISA
- Discover
- MasterCard
- American Express
SHIPPING
Standard shipping is 1-5 business day delivery on most items.
Additional delivery days may apply in some instances, such as hazardous items, mounted tires and wheels, oversized items, truck freight items, select zip codes, Global Shipping Program and remote delivery areas.
SALES TAX
Taxes may be applicable at checkout
RETURN POLICY
If you are not completely satisfied, return the new/unused item in the original box pre-paid (customer is responsible for shipping cost) postmarked within 90 days of purchase, with a copy of the invoice, for a refund/exchange. Once a return has been approved, the credit will be processed within 2 days to original form of payment. A 15% restocking fee will be deducted from any item returned more than 90 days after the ship date. A 15% reboxing fee will be deducted for any item not returned in its original packaging.
PAYMENT
We accept the following forms of payment:
- PayPal
- VISA
- Discover
- MasterCard
- American Express
SALES TAX
Taxes may be applicable at checkout.
SHIPPING
Standard shipping is 1-5 business day delivery on most items.
Additional delivery days may apply in some instances, such as hazardous items, mounted tires and wheels, oversized items, truck freight items, select zip codes, Global Shipping Program and remote delivery areas.
RETURN POLICY
If you are not completely satisfied, return the new/unused item in the original box pre-paid (customer is responsible for shipping cost) postmarked within 90 days of purchase, with a copy of the invoice, for a refund/exchange. Once a return has been approved, the credit will be processed within 2 days to original form of payment. A 15% restocking fee will be deducted from any item returned more than 90 days after the ship date. A 15% reboxing fee will be deducted for any item not returned in its original packaging.
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