MakeEverything
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| posted on 30/4/11 at 04:16 PM |
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Gritty Brake Pedal?
Hi All,
My car has been standing for a year or so, and ive been doing the brakes. I had a problem with a gritty and very stiff pedal, so started to rebuild
the calipers. Ive done one (which was squeaking before) but still have a horrible feel on the pedal. Could this be the master / servo?
Thoughts / questions please.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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jacko
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| posted on 30/4/11 at 04:23 PM |
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What do you mean by Gritty
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MakeEverything
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| posted on 30/4/11 at 04:27 PM |
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Its like pushing my foot into a bucket of stones. and i have to pull the pedal back for half of the travel with my foot.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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marcjagman
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| posted on 30/4/11 at 04:29 PM |
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Bleed all the brakes, if that doesn't work then master cylinder could be FUBAR
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jacko
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| posted on 30/4/11 at 04:30 PM |
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Could it be the bearings in the pedal ?if not i would say m /cylinder seals sticking
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MakeEverything
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| posted on 30/4/11 at 04:35 PM |
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OK, thanks. Ill get the master cylinder out for a check. What about the servo?
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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austin man
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| posted on 30/4/11 at 04:35 PM |
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remove the pushrod and clean it may be a little rusty and binding. We has a similar problem on an Indy it wa due to the angle and thickness of the
rod, trimmed it down and Voila no problems now. The ros was catching inside the cylinder
[Edited on 30/4/11 by austin man]
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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blakep82
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| posted on 30/4/11 at 04:37 PM |
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check the pivot too.
might be a pivot bolt you forgot to grease? 
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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MakeEverything
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| posted on 30/4/11 at 05:03 PM |
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quote:
Originally posted by blakep82
check the pivot too.
might be a pivot bolt you forgot to grease?
You mean Clevis? 
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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blakep82
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| posted on 30/4/11 at 06:47 PM |
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quote:
Originally posted by MakeEverything
quote:
Originally posted by blakep82
check the pivot too.
might be a pivot bolt you forgot to grease?
You mean Clevis?
nope  the pivot. clevis joins your pedal to the master cylinder push rod, but either above or below that, you have to pivot the pedal somewhere!
usually a bolt.
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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MakeEverything
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| posted on 30/4/11 at 07:36 PM |
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quote:
Originally posted by blakep82
quote:
Originally posted by MakeEverything
quote:
Originally posted by blakep82
check the pivot too.
might be a pivot bolt you forgot to grease?
You mean Clevis?
nope the pivot. clevis joins your pedal to the master cylinder push rod, but either above or below that, you have to pivot the pedal somewhere!
usually a bolt.
Nope, i have push / pull cables doing the job and clevises both ends.
Ive fitted the calipers back on and tried the handbrake, but the handbrake doesnt seem to operate the piston?? When trying to get the cable off the
other day, i rotated the mechanism - is it possible to rotate this too far to break it?
Getting a bit pissed off with brakes now!!
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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blakep82
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| posted on 30/4/11 at 07:48 PM |
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push pull cables on your brake pedal? eh? i'm lost now. you said you had problems with the pedal first of all!
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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MakeEverything
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| posted on 30/4/11 at 07:55 PM |
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quote:
Originally posted by blakep82
push pull cables on your brake pedal? eh? i'm lost now. you said you had problems with the pedal first of all!
The pedal is connected to a push pull cable, which operates the servo. The servo is mounted under the bonnet (mid engined car) laterally, so needs to
operate through 90 degrees. Both ends have clevis pins holding the cable on, and the outer is mounted at both ends, to fixed points.
I still have problems with the pedal, but have discovered that the handbrake doesnt work.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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blakep82
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| posted on 30/4/11 at 08:11 PM |
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and how does your pedal work without some kind of pivot point? lol
is you cable nice a free to move? lubricated etc
[Edited on 30/4/11 by blakep82]
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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britishtrident
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| posted on 30/4/11 at 08:25 PM |
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The idea of depending on cable to operate the service brake send shivers down my spine.
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MakeEverything
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| posted on 30/4/11 at 08:36 PM |
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quote:
Originally posted by blakep82
and how does your pedal work without some kind of pivot point? lol
is you cable nice a free to move? lubricated etc
[Edited on 30/4/11 by blakep82]
Muppet. The rod is connected BELOW the pivot!! lol
Trident, its a push / pull cable, not like a handbrake cable.
ETA: and the pedals are floor mounted, which means its the same as your diagram blake, but upside down.
[Edited on 30-4-11 by MakeEverything]
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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daviep
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| posted on 30/4/11 at 09:13 PM |
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My fiver would be on that the cable is not sliding freely, they don't like being bent too tightly, they also don't like water very
much.
Common name for a push/pull cable is a "bowden cable" they are used extensively on plant and machinery and aren't particularly
strong or reliable. Remember that if you are using the cablein the push mode then it will only be as strong as the anchors on the outer of the
cable.
Like BT I wouldn't be happy with a cable operating my brakes,is it not possible to use rods and bell cranks?
Davie
[Edited on 30/4/11 by daviep]
“A truly great library contains something in it to offend everyone.”
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MakeEverything
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| posted on 30/4/11 at 10:34 PM |
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quote:
Originally posted by daviep
My fiver would be on that the cable is not sliding freely, they don't like being bent too tightly, they also don't like water very
much.
Common name for a push/pull cable is a "bowden cable" they are used extensively on plant and machinery and aren't particularly
strong or reliable. Remember that if you are using the cablein the push mode then it will only be as strong as the anchors on the outer of the
cable.
Like BT I wouldn't be happy with a cable operating my brakes,is it not possible to use rods and bell cranks?
Davie
[Edited on 30/4/11 by daviep]
Ill have a look at the cable when i take it all apart. I might look to replace the master and ditch the servo altogether. Just means ill need to
rethink the master. This would allow it to be mounted on the bulkhead with a remote reservoir. Its all stuff im going to look into tomorrow.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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Mr Whippy
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| posted on 1/5/11 at 03:03 AM |
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low mounted master cylinders are bad for getting grit in them, you can get rubber boots to go over the end that still allow the pushrod to go through,
classic vw's like the beetle use them and they fit most production car ones too
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scudderfish
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| posted on 1/5/11 at 07:58 AM |
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Ditch the servo unless you are too delicate to stomp on the pedal.
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MakeEverything
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| posted on 1/5/11 at 09:01 AM |
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quote:
Originally posted by scudderfish
Ditch the servo unless you are too delicate to stomp on the pedal.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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britishtrident
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| posted on 1/5/11 at 10:10 AM |
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Rover 75 uses a BMW imposed brake servo layout with a neat bell crank connected to the pedal to allow the master cylinder and servo to sit
transversely.
When Lancia brought out the mid engined "Lancia Beta Montecarlo" they got a lot of complaints about premature front wheel locking, the
second series cars known as the "Lancia Montecarlo" cured this by simply deleting the servo.
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