2004 Camry brakes

ADAMPAUL

MEMBER
2004 TOYOTA CAMRY
4 CYL
2WD
160,000 MILES

2004 camry 4cyl. 3 months ago front left brake caliper seized, replaced caliper, pads and turned rotors, 1 month later both front brakes began to not completely release the rotor after releasing brake pedal, I then replaced master cylinder and blead system, braking did good for 2 weeks, now the brakes are not releasing the rotors unless I bleed small amounts of fluid either from the calipers or from the fittings at the proportioning valve or the abs, even then the "fix" is very short-lived. Help

Monday, August 15th, 2011 AT 4:24 PM

1 Reply

CARADIODOC

MECHANIC
34,330 POSTS

You're a few steps ahead of most people. Try releasing fluid pressure right at the master cylinder. If that works, suspect the brake fluid is contaminated with petroleum product or the brake light switch is holding the brake pedal down a little.

Fluid contaminated with engine oil, power steering fluid, or transmission fluid will cause the rubber seals in the master cylinder to swell and grow past the fluid return ports, blocking them off and trapping the fluid. The ONLY proper fix for that is to replace every part that has a rubber part that contacts the brake fluid, and flushing and drying the steel lines. That includes rear wheel cylinders, calipers, ABS hydraulic controller, master cylinder, and all four rubber flex hoses.

After you replaced the master cylinder, contamination will leach out of other rubber parts and recontaminate it. That will take about a week or two to show up again, just like you described.

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Friday, March 5th, 2021 AT 11:00 AM