W126 brake problem
 

My 1987 420 SEL lost brake pedal - goes nearly to floor before engaging brakes. Checked and bled brakes without benefit. Red brake warning light stays on despite release of e-brake. Any ideas what has happened? Thanks, Mark

Is there any visible fluid leaking anywhere?

w126 brake problem
 

I didn't see any leaks, Thanks, Mark

Here are some ideas.

While you depress the brakes have a helper see if any of the soft line from the caliper to body hard lines are swelling.
OR
Pinch off the soft lines (vice grips) on each wheel position. If you have same symptom problem is most likely in booster or master cylinder. Then troubleshoot the master cylinder/booster. If problem ceases remove 1 clamp from each wheel until you identify the problem wheel.

I have made some assumptions that your fluid levels are correct, no visible leaks.

cdplayer
 

If these suggestions do not solve your problem, remove the vacuum line leading from the brake booster to the engine and inspect for cracks. Also check function of check valve in this line. Just a thought..

I don't think you can pinch off the flexible lines without ruining them. They are not just rubber, they have spiralled steel in them.

You could be suffering an internal leak in the master cylinder. Replacement or rebuilding is the only option.

Tom W

It doesn't take much to close them off - not that you would want 1/8" gap in your vice grips.

i think your master cylinder is shot if you have no sign of leaks

A swelling brake line if fairly common on the 126. It's worth a check $14 vs $102

Its probably the master cylinder.

As for the E brake light it probably needs to be adjusted. You can take up the slack under the car where the cable attaches to that big metal thing, forget what its called.

Big Metal Thing:P

Notbremse einstellschraube?


Better?:P:D

Thanks Everyone,
Let me get to work and I'll let you know what I find. Thanks, Mark