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Vehicle Info NeededLEED BRAKESPART NUMBER: 633-4N6B4
1955-1968 GM Full Size Power Brake Master Cylinder & Booster Kit
$51999
Ships on Sep 03, 2026
Lowest Price GuaranteeGM Chrome 8 in. Dual Boosters
Power Brake Master Cylinder & Booster Kit1955-1968 GM Full Size Chrome Flat Top 1 1/8 in. Master Cylinder Chrome 8 in. Dual Booster Chrome Disc/Disc Proportioning Valve
LEED Brakes 4N6B4 Features:
New 8" Dual Diaphragm chrome plated power brake booster, master cylinder & 4 wheel disc proportioning valve combo. This 8" power booster is hand polished before a chrome finish is applied for a top quality finish. The top quality power brake booster is designed mount directly to your factory firewall. Also included in this kits is a new chrome 1-1/8" bore flat top master cylinder and proportioning valve equipped to work with 4 wheel disc brake applications.- New unit not remanufactured
- Includes brackets and pushrod
Part TypeBrake Master Cylinder and Booster Assembly
BrandLEED BRAKES
Package Height10.5
Package Width10.5
Package Length18.25
Weight18.0 PG
Part CategoryPerformance Parts
Brake Booster FinishChrome
Bracket IncludedYes
Brake Booster TypeDual Diaphragm
Master Cylinder FinishChrome
Housing MaterialSteel
Brake Booster IncludedYes
Master Cylinder Bore Size1-1/8 in
Mounting Hardware IncludedNo
Master Cylinder Port Quantity4
Brake Booster Diameter8 in.
Booster Housing Diameter8 in.
Bleeder Hoses IncludedYes
Brake Pedal Pushrod IncludedYes
Master Cylinder MaterialAluminum
Master Cylinder Cap IncludedYes
Booster Diaphragm TypeDual
Brake Lines IncludedFrom Master Cylinder to Valve
Booster TypeVacuum
Master Cylinder IncludedYes
Part FitmentSemi Universal
Vendor Part Number4N6B4
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
