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Brakes

240Ireland

240Ireland

New member
Joined
Jan 25, 2024
Location
Cork, Ireland
After a 60 minute drive in my 1993 240 se manual, I pulled into a service station to refuel. The brakes were fine. After refuelling, I pulled away, yet at the exit the beaten pedal went to the floor. I stopped it with the handbrake. After about 3 pumps of the pedal, the brakes were fine again. Any ideas what it might be? Is the master cylinder on the way out, or is it something else?
 
Classic bad master cylinder symptoms. The seals are bypassing internally.

Edit: Could also be ABS issues. Did the light come on?
 
You had a sticking caliper a few months ago. Did you change it? Did you get ALL the air out of the lines? Heat can make any trapped air expand and slowly push the fluid backwards into the reservoir (while you're stopped after a nice hot drive?), and could take a few pushes to recompress to where it *seems* like "the brakes were fine again".
 
I did change the caliper and pads and did indeed bleed the brakes. I think I did get all the air out. If it is possible that there is some air in the system, would that mean the master cylinder seals are now damaged?
 
You could easily have what MasterBlaster described going on. More than once I have had a brake caliper stick and get the brake caliper so hot the fluid boiled resulting in no brakes. Once the caliper cooled, I had brakes again.
 
240Ireland said:
I did change the caliper and pads and did indeed bleed the brakes. I think I did get all the air out. If it is possible that there is some air in the system, would that mean the master cylinder seals are now damaged?
Click to expand...
Do you still have to pump the pedal to get any pressure built up?
 
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