AndyW
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| posted on 30/6/13 at 08:43 PM |
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poor feel in brake pedal
I have a sierra master cylinder which was new. I have bled the brakes, but the pedal feel spongy and when I dove up the driveway today the brakes seem
almost non existent. Any idea's to what it could be, could there still be air in the system, although in have bled the twice To make sure. also
the handbrake only comes up two clicks. Is it just a case that it all needs adjusting on the rears (drums) and the fronts need bedding in?
thanks
andy
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britishtrident
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| posted on 30/6/13 at 09:19 PM |
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If you bled it properly then it points to a leak at union. Don't expect to see obvious leaks of fluid go round them all cleaning them and
examining them and examining them using a torch while somebody pushes the pedal hard.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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rusty nuts
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| posted on 1/7/13 at 06:27 AM |
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Back off the handbrake adjuster until you have loads of slack , remove brake drums and manually adjust the auto adjuster on each brake shoe one click
at a time refitting the brake drum between adjustments until nearly all of the clearance between the shoes and drums is taken up.Your problem may well
be as simple as adjusting the rear brakes to sort it out
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AndyW
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| posted on 1/7/13 at 06:56 AM |
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Thanks guys,
I will pop the drums off and have a peek, will report back...
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daviep
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| posted on 1/7/13 at 07:05 AM |
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You need to try and identify the problem in a methodical manner, use a pipe clamp on flexi hose to try and isolate which corner / end the problem is
with. I would be expecting it to not be fully bled or a calliper which is stuck and flexing the disc or pad.
Cheers
Davie
“A truly great library contains something in it to offend everyone.”
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adithorp
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| posted on 1/7/13 at 09:06 AM |
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Did you bleed the brakes with the drum adjusters fully let off? If not the pistons will be out a bit and that can let a bubble of air remain in
them.
Let the adjusters and h/brake cable off, bleed, then manually adjust the "auto adjuster", then h/brake cable.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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davidimurray
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| posted on 1/7/13 at 09:10 AM |
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Have you got enough push rod travel ? I spent months chasing the problem with my brakes. Sierra M/C has 30mm of travel at the push rod and you must be
able to use all this without the pedal hitting the bulkhead. Mine had about 23mm of travel and would go hard but could just be made to touch the
bulkhead using all my might. Extended the push rod and with about 26mm of travel the pedal went solid.
Also do you have a hydraulic brake switch? If so make sure the contacts are at the bottom or side with a T and a bleed nipple as trapped air in the
switch can cause a spongy feeling.
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britishtrident
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| posted on 1/7/13 at 12:23 PM |
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Extending the pushrod will lead to trouble if you are not very very careful !
As I said at the start before you do anything check for leaking unions.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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chrisni1986
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| posted on 1/7/13 at 08:42 PM |
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leaks or failing that try and borrow a pressure bleeder, ive seen problems in the past with it being hard to get a good pedal, one bleed with the
pressure bleeder and wham there it was!
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AndyW
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| posted on 1/7/13 at 09:10 PM |
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quote:
Originally posted by chrisni1986
leaks or failing that try and borrow a pressure bleeder, ive seen problems in the past with it being hard to get a good pedal, one bleed with the
pressure bleeder and wham there it was!
I used a pressure bleeder
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