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Author Topic: Brakes  (Read 1639 times)

Hawk

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Brakes
« 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
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Cees Klumper

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Re: Brakes
« Reply #1 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.
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Cees Klumper
1969 Mercedes 280 SL automatic
1968 Ford Mustang 302 V8
1961 Alfa Romeo Giulietta Sprint Coupe 1600
1962 FIAT 1500S OSCA convertible
1972 Lancia Fulvia Coupe 1.3
1983 Porsche 944 2.5
1990 Ford Bronco II

Hawk

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Re: Brakes
« Reply #2 on: October 18, 2021, 02:32:15 »
Thanks
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Pawel66

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Re: Brakes
« Reply #3 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.
« Last Edit: October 18, 2021, 05:47:59 by Pawel66 »
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Pawel

280SL 1970 automatic 180G Silver
W128 220SE
W121 190SL
G-class

Hawk

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Re: Brakes
« Reply #4 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.
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Vander

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Re: Brakes
« Reply #5 on: October 18, 2021, 12:05:32 »
Brake master cylinders can leak internally into the booster.
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1969 280SL

Pawel66

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Re: Brakes
« Reply #6 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?
« Last Edit: October 18, 2021, 14:57:13 by Pawel66 »
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Pawel

280SL 1970 automatic 180G Silver
W128 220SE
W121 190SL
G-class

Flim

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Re: Brakes
« Reply #7 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
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