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Posted by Chris Case [63.199.242.188] on Thursday, June 09, 2011 at 18:11:03 :
In Reply to: Brakes driving me nuts posted by D Sherman [72.47.9.228] on Thursday, June 09, 2011 at 11:21:21 :
They can get so gummy from age that they drag, like having a bad lining inside a hose. Then they overheat. Your pulsing might have been the fluid turning to steam? then condensing?
Is your bleeding technique to pump pedal with bleeder closed, hold pedal down, then open bleeder, let air/fluid out, close bleeder, repeat. Keep reservoir full, top up after every two 'bleeds'. I do my own as a one man operation, using a 2x4 jammed between seat and pedal to keep it down. Start at farthest cyl, work close. At last one, driver's front, I reach up and pull the pedal down while wrenching the bleeder. Having them adjusted loose lets the other cyls push fluid/air back out the one with the open bleeder, hastening the job.
Poorly adjusted shoes or shoes that are not worn to the drums can cause a soft pedal. Drums can crack too, might cause the bad pulsing you had.
Wheel cyls can also allow air to get sucked in when the pedal is released. That is why masters have the residual check valve in them. The RCV keeps abput 5-10 psi in the system to prevent that. Used to be that cyls had a cup-flarer on the springs to keep the rubber cup expanded against the bore. Not no more.
I'd say make ferdamsure your bleeding is good, then pull the drums and get the adjusters working and inspect the drums for cracks. If nothing turns up, bebuild the cyls.
Hey, I bought cups only at Napa. $2.50 each, $5/per cyl. Add a UP prefix to the part number on the cup, as in UP-453. UP-304? I don't remember the numbers.
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