Pumping?

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leblanc

leblanc

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Usually having to pump the brakes from time to time in order to get decent pressure to stop usually means that the master cylinder needs a rebuild or replacement. Am I right?
-Are rebuilt units dependable or should I go new?
 

I have had it happen before and the brakes needed to be bled. IMO it could be a variety of things, wheel cylinder, pin hole in brake line(chk for leaks)
 
Put pressure on the pedal and hold it; if it slowly goes down-master. Otherwise, air in the system, Or brakes need adjusting.
 
As stated if the pedal falls when holding MC, if not air in system, or master cylinder not big enough for system.
 
JG,

This could be from many things..after driving a brit car ..this was something that I was always on the look out for.

#1 - make sure your brake fluid is compatible with the rubbers..this problen usually sticks it's ugly head up in 1.5 - 2 years..

# 2 - you can buy rebuild kits far cheaper than remans..

# 3 - you could have a very small leak somewhere..you didn't say anything about having to add more fluid...and you should expand your worries beyond your master. Can you g\find a leak anywhere ??

*4- are all your pads good ?

Think about picking up a do it yourself one man bleeder kit...I want to see you at the nationals :)

Cheers, Ian.
 
I had a DeSoto do that, one of my front wheel cylinders would suck air back in past the seal... it never leaked fluid out, just sucked air in. I would pump the brake pedal once with the bleeder open and then close the bleeder and they were fine all day, let it sit overnight, and had to do the same thing again.... replacing the wheel cylinder and there we go. I would agree, it sounds like air in the lines somewhere, start with the longest run, bleed that, and then bleed the next shortest, etc....
 
You didn't say if it was a disk brake car or not. I reversed the calipers and spindles on my 73. Could not get all of the air out for a while. Figured out that the bleeder was lower than the line into the piston. I removed the caliper, clamped piston back into caliper housing and bled brakes with the bleeder at the top. No problems since.

Good luck. A car that won't turn or stop on cue is not much fun.
 
grassy said:
JG,

This could be from many things..after driving a brit car ..this was something that I was always on the look out for.

#1 - make sure your brake fluid is compatible with the rubbers..this problen usually sticks it's ugly head up in 1.5 - 2 years..

# 2 - you can buy rebuild kits far cheaper than remans..

# 3 - you could have a very small leak somewhere..you didn't say anything about having to add more fluid...and you should expand your worries beyond your master. Can you g\find a leak anywhere ??

*4- are all your pads good ?

Think about picking up a do it yourself one man bleeder kit...I want to see you at the nationals :)

Cheers, Ian.
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don't worry I'll be there
 
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