-matt
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| posted on 10/10/12 at 08:42 AM |
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Brake pedal hitting stopper?
Basically, my car is using an old fiat master cylinder, ive blead the system with an eezibleed system (including the rear sierra calipers upside
down).
But when im pressing the brake pedal hard, im hitting the stopper, surely this shouldn't happen?
The car does stop and lock the brakes, but it just doesnt feel right.
Does this meen there must be a bit of air still in the system?
Will the only way to get this out be manually bleeding?
Cheers
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Bluemoon
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| posted on 10/10/12 at 09:10 AM |
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Probably need more info, what do you mean "hitting the stopper". The pedal should be rock-hard with little travel; any spongy feelling
(air the system, need to fix) or flex (in pedal/bulkhead an issue if excessive).
If there is a leak (constant pedal pressure cause pedal to keep moving until it reaches the end of the pedal) this will need fixing.
Are sure the pedal is hitting a mechanical stop?
Dan
[Edited on 10/10/12 by Bluemoon]
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Davegtst
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| posted on 10/10/12 at 10:10 AM |
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Have you bleed the rears properly? You need to take the calipers off and hold them with the bleed nipple at the top otherwise you will get air
trapped in them. Make sure to put a block of wood in between the pads so it holds the piston still.
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-matt
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| posted on 10/10/12 at 10:19 AM |
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The pedal is basically moving all the way to the stopper at the end of the cylinder.
There is no leak.
I did hold the rear callipers upside down when i bleed it before with a power bleeder.
I'm going to try it again now, but the more conventional manual way with the brake pedal and bleed nipple.
Oh, and its deffinally a mechanical stop, as i can hear a thud, when it hits it, and its deffinally not the bulkhead.
[Edited on 10/10/12 by -matt]
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maccmike
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| posted on 10/10/12 at 10:36 AM |
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Id go with air still in the system
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maccmike
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| posted on 10/10/12 at 10:37 AM |
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eezibleeds are good but I still do it the conventional way to finish it off.
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-matt
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| posted on 10/10/12 at 12:34 PM |
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Ive just done the fronts the 2 person method, a few bubbles of air came out, but the pedal is still bottoming out quite easy, so the air must either
be in the rear, or trapped somewhere.
I just tried the one rear, and used a piece of batten to stop the piston moving, but it just crushed the batton!, so need to find something a bit
tougher first.
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-matt
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| posted on 10/10/12 at 02:21 PM |
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Ive now done the rears, its a little bit better, but still hitting the stopper!
Although one thing I've noticed is, if i have the hand brake on, the brake pedal is then nice and hard, but as soon as i take the hand brake
off, its gone all spongy again!
Does this mean there is air in the h/b mechanism? I've tried yanking the h/b on and off while bleeding, and the nipple right at the top, but no
success yet.
Anyone any ideas?
Cheers
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britishtrident
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| posted on 10/10/12 at 02:30 PM |
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Slacken the handbrake cable right off and pump the the pedal hard a few times then re-tensions the hand brake cables as per as per work shop
manual.
That dosen't work try taking the rear calipers off and adjusting by hand by screwing the pistons ou.
[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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-matt
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| posted on 10/10/12 at 03:06 PM |
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i don't have a work shop manual, I've just slackened the h/b right off, have tried pumping the pedal, but I'm not getting a good
feel.
What am i needing to do?
Thanks
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renetom
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| posted on 10/10/12 at 03:56 PM |
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brakes
Hi
No disrespect , but when the pedal is in its rest position is the master cylinder pushrod fully out +
a bit of free play before you move it ?.
Found this out many years ago when a friend had problems with his car & the rod was too long.
Otherwise if there are no leaks & everything is tight hoses connectors etc .
Then it has to be air in the system.
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-matt
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| posted on 18/10/12 at 01:19 PM |
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i don't have a work shop manual, I've just slackened the h/b right off, have tried pumping the pedal, but I'm not getting a good
feel.
What am i needing to do?
Thanks
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renetom
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| posted on 18/10/12 at 03:27 PM |
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brakes
Hi Matt
Is there some kind of physical Stop behind the brake pedal, maybe with an adjusting screw ???
Post us a pict of your pedals.
It is piped up correctly ? (sorry)
Just had a look at our Sierra manual 1982-89 in that the only rear callipers shown are ABS ones , not sure if these are the same as std callipers ,
could this be the problem ????
If your not too far from me I'll come & have a look.
René
Just had a thought could it be the adjusters on the rear not working ?
There are so many variables.
[Edited on 18/10/12 by renetom]
[Edited on 18/10/12 by renetom]
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whitestu
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| posted on 18/10/12 at 03:39 PM |
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Just a thought, how hard are you pushing the pedal? When I changed my MC from a 22mm Sierra one to a 19mm Fiat one the pedal initially felt rubbish
when pressing it in a stationary car, but on the road it is great.
Are you carrying out a similar conversion?
You say the wheels will lock so does the pedal hit the stop before this happens? If not maybe it is just the difference in feel of difference MCs.
Stu
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-matt
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| posted on 19/10/12 at 05:08 PM |
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Thanks, all sorted now, I think it just needed a really good bleed!
On the road, it does seem to have good feel now.
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