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My brother in law is having some issues with his rear brakes. We did a complete bleed, changing the brake fluid. There is no air in the lines but when we try to use the brake pedal it goes all the way down. You can pump the brake a few times and the pedal functions better. However, after a few seconds it doesn't work right anymore. He has 37,000 miles on his 1800 retro and the brake pads are new. It was acting up before he put the new pads on and has never been right since. It starting acting the way at about 20,000 miles. Any input is appreciated.
 

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air leak somewhere.

check the brake lines and fittings.

go over the bleeding procedure. again

if it started without any work being done, I would look for a leak.

it doesn't take much it may not leak fluid but just let a small amount of air in. A friend had the same problem when he changed to steel brake lines and they were taking in air at one of the banjo fittings near the master cylinder. an extra washer or 2 on the bolt fixed it.

good luck


John
 

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The rear brake also operates some of the front brake. Make sure there's no air in the front lines. There's a particularly nasty bend shortly after the splitter that could cause all sorts of cussing and swearing. You may end up having to unbolt and raise the calipers to get it out.

If you pump it up, hold it, and the pressure eases off (while still holding) you prolly have a leaking master cylinder. That is, if you don't see fluid on the concrete anywhere.
 

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If none of the above fixes it, it could be a defective master cylinder. What your describing sounds like an internal bypass :wink: But, definitely check all fittings and banjo's for tighteness.
 
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