Pagoda SL Group

W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: Hawk on October 17, 2021, 22:20:24

Title: Brakes
Post by: Hawk on October 17, 2021, 22:20:24

The brakes on my 280 SL went out completely and then the next day they were back up. Any ideas what is wrong? Thanks

Title: Re: Brakes
Post by: Cees Klumper on October 18, 2021, 01:20:45

I'd guess the master cylinder (or the brake booster). Never had this happen though so not sure.

Title: Re: Brakes
Post by: Hawk on October 18, 2021, 02:32:15

Thanks

Title: Re: Brakes
Post by: Pawel66 on October 18, 2021, 05:40:11

Have you examined for traces of leaks across the brake system components?

It is also important: where they "out" because the pedal went to the floor with no braking effect or the pedal was hard and the braking effect was very weak?

If the latter, that suggests the faulty booster. Particularly if you also heard a loud hissing sound and your idle revs went significantly up.

Title: Re: Brakes
Post by: Hawk on October 18, 2021, 09:19:27

Brake pedal went all the way to the floor with very little braking effect. I can see no evidence of brake fluid leakage.

Title: Re: Brakes
Post by: Vander on October 18, 2021, 12:05:32

Brake master cylinders can leak internally into the booster.

Title: Re: Brakes
Post by: Pawel66 on October 18, 2021, 14:48:57

Yes, well, I am not educated in this, so to me if pedal goes to floor it usually means a leak somewhere: master cylinder, lines, hoses, connections, brake force regulator, calipers.

I did not know it could be internal to booster as Vander kindly described.

Could be old/damaged hoses that get swollen...

But maybe pedal in the floor can also be something else - mechanical connection at the booster?

Title: Re: Brakes
Post by: Flim on October 19, 2021, 19:38:59

Were you driving or had been driving at the time when this happened or did you notice this when the car was cold?

If brakes were fine when you started the journey and then the pedal went to the floor after driving - it may suggest a stuck brake caliper piston. This can happen through worn brake caliper seals.

Checking the temperature of each wheel/hubcap after a gentle drive may indicate the wheel/wheels where the suspect caliper may be.

Charles