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Discussion Starter #1
I have this strange problem with my brakes that I really want to correct. Sometimes after driving on the highway for a long period of time, when I apply the brakes, the pedal goes down significantly further than it does during normal driving. As soon as I let up and press it a second time, its right where it should be.

Any thoughts on whether this is the master or the brake booster? I replaced the vacuum line about a year ago, so I doubt its that....

Thanks,
Ed
 

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4,450 Posts
Sounds like a master cylinder. Booster would show a very stiff pedal if it failed.

Best Regards,
John M
 

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99 Posts
I would think it is the master cylinder. Fluid may be bypassing one of the seals. It has happened to me, I beld the entire system with a pressure bleeder and the problem seemed to go away.
 

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Trained (ex)Professional, , 1953-2018 RIP,
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16,232 Posts
Excessive wheel bearing play can cause caliper piston knockback. This can result in a long brake pedal on first brake application.
 
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