1967 250S Clutch Master Cylinder - Need Advice - PeachParts Mercedes-Benz Forum

karshack · #1 04-21-2016, 02:44 AM

Hi,

I've got a 4-speed floor shifter that I'm working on bit-by-bit. It is my daily driver so I try not to do anything that will keep it out of commission for longer than the 2-day weekend.

I don't have gear shifting problems; rather, I have long pedal play when depressing the brake pedal. I finally noticed that the carpet under the pedal assembly was wet with something. It was fluid from the clutch master cylinder. So, it is leaking fluid, I've got a long-traveling brake pedal, and I can hear a squishy sound (and a change in the sound of the engine) when I fully depress the brake pedal.

I've looked underneath at the clutch slave cylinder to see if that was also leaking. It does not appear to be leaking. But, the rubber boot surrounding the lever from the transmission is deteriorated from age and that area is very oily.

So I think I know that I have to replace the clutch master cylinder. My question is: Can I remove the old one, and install a new one without having to use an hydraulic press? - see collar or sleeve #60 and #61 from the parts catalog page.

I've got a pic of the clutch master cylinder and a scan of the assembly from my 1965 Catalog "A" 12-110 (glovebox size).

Thanks for any suggestions.

JeffreyNMemphis · #2 04-21-2016, 03:40 PM

The clutch is a bolt on replacement. Two bolts hold it on the firewall. The hydraulic fluid line screws on. Pretty easy job.

JeffreyNMemphis · #3 04-21-2016, 04:06 PM

The part number is 000 295 00 35 for the hydraulic hose from the slave cylinder attached to the transmission to the clutch master cylinder. Our host here at Peach Parts sells it for $36.00.

Mark DiSilvestro · #4 04-26-2016, 01:22 PM

Quote:

Originally Posted by karshack

Hi,

I've got a 4-speed floor shifter that I'm working on bit-by-bit. It is my daily driver so I try not to do anything that will keep it out of commission for longer than the 2-day weekend.

I don't have gear shifting problems; rather, I have long pedal play when depressing the brake pedal. I finally noticed that the carpet under the pedal assembly was wet with something. It was fluid from the clutch master cylinder. So, it is leaking fluid, I've got a long-traveling brake pedal, and I can hear a squishy sound (and a change in the sound of the engine) when I fully depress the brake pedal.

I've looked underneath at the clutch slave cylinder to see if that was also leaking. It does not appear to be leaking. But, the rubber boot surrounding the lever from the transmission is deteriorated from age and that area is very oily.

So I think I know that I have to replace the clutch master cylinder. My question is: Can I remove the old one, and install a new one without having to use an hydraulic press? - see collar or sleeve #60 and #61 from the parts catalog page.

I've got a pic of the clutch master cylinder and a scan of the assembly from my 1965 Catalog "A" 12-110 (glovebox size).

Thanks for any suggestions.

Your clutch master does look a mess, However, any fault there should NOT affect the brake pedal. If your brake pedal is low, check for leaks in the front & rear brake hydraulics, for sticking front or rear brake-pads. If all that checks out and there are no external brake-fluid leaks, you could have an internal leak in the brake master-cylinder. Some minor & brief 'squishy-sound' and change in engine idle when depressing the brake pedal may be normal - the result of air bleeding from the brake power-assist booster to the intake manifold. If these symptoms are more than minor & brief, you could have a power-brake booster failing. But recheck all that AFTER you fix the low brake pedal.

Happy Motoring, Mark

ejboyd5 · #5 04-26-2016, 02:30 PM

Have you been adding fluid to either the brake or clutch systems?

JeffreyNMemphis · #6 04-26-2016, 02:31 PM

Are the rear brakes drum or disc? If drum brake, they may need adjustment. If the brake shoes have worn down then you would eventually have excessive travel in the brake pedal.