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Technical Training

Master Cylinders

Condition Code Procedure
Brake fluid leaking from rear of master cylinder bore B Require repair or replacement
Brake pedal drops intermittently A Require repair or replacement
This condition may be normal on some vehicles equipped with anti-lock brakes.    
Fluid level low   Further inspection required
Refer to OEM procedures for adjusting low fluid level. Inspect for brake hydraulic leaks and friction material wear.    
Internal valve failure A Require repair or replacement
Master cylinder leaking brake fluid internally A Require repair or replacement
Piston does not return A Require repair or replacement
Ports plugged A Require repair or replacement
Rubber master cylinder cover gasket distorted and gummy A Require replacement of the gasket
This condition may indicate contaminated brake fluid. See Brake Fluid.    
Legend
A Part no longer performs intended purpose
B Part does not meet a design specification (regardless of performance)
C Part is missing
1 Part is close to the end of its useful life (just above discard specifications, or weak; failure likely to occur soon, etc.)
2 To address a customer need, convenience, or request (to stiffen ride, enhance performance, eliminate noise, etc.)
3 To comply with maintenance recommended by the vehicle’s Original Equipment Manufacturer (OEM)
4 Technician’s recommendation based on substantial and informed experience
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