Is it Time For a New Master Cylinder?

Brian757

New member
I have a 2002 with roughly 140,000 miles on it. My truck's brakes are getting air in the lines weekly, causing popping from the front calipers.

One thing to mention is that I have converted to Tundra 231mm calipers.
I also get the brake booster sound, which sounds like a goose under the dash. But I'm thinking my brake booster is fine, that the master cylinder is causing the BB to act up.

As it is a 2002, I do not have the old style hydraulic MC, it is the newer one that has the VSC/TRAC integrated.

I'm not taking any brake fluid loss, as the fluid has sat at the full line for the past month, and the issue has been a month long.

When I'm stopped, I can depress the brake pedal and hear the booster engage.

I know master cylinders are not cheap, so I would like some suggestions and information on how to pinpoint the issue.

Thanks all!!
 
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One quick booster test for me has been to cut the car/truck off after running, then pump the brakes 5 times, then push down on the pedal. If it drops, vacuum is not being held by the booster and it is time for a new one, or used.

If you aren't losing any fluid, nor are the brakes going to the floor, it isn't the MC.

Car-Part.com--Used Auto Parts Market
 

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