Register Login
FIAT Auto Specialist Team
Reply
 
Thread Tools
Old 20-08-2012   #1
Join Date: May 2007
Posts: 661
Thanks: 18
Trader Rating: 0
rawill has donated!
New Zealand 
brake pedal too long

Brake pedal question

My brake pedal goes to far in, nearly to the floor, it will not pass a WOF (MOT).
I have checked the pads and linings and adjustment they are all fine.
Handbrake is locked on at 3-4 clicks.

I think I read on here that a faulty brake proportioning valve could cause this.

Can anyone confirm this.

Robin
__________________
UNO 84-70s,
03 V6 Renault Laguna, SAABs 97 9000CD st I, 93 9000griffin st II, 93 9000CSI, C900 LPT vert,
Others:73 Rover P6B (project) and 1 Suzuki GT380
rawill is offline Reply With Quote Quote 
Old 20-08-2012   #2
Join Date: May 2007
Posts: 661
Thanks: 18
Trader Rating: 0
rawill has donated!
New Zealand 
Re: brake pedal too long

It looks like the friction adjusters are not holding.
I found the LR shoes would not "stay out" the return springs "pulled" the shoes back fully in.

Hence the brake pedal has to go all the way down to get the rear shoes to contact the drum.
__________________
UNO 84-70s,
03 V6 Renault Laguna, SAABs 97 9000CD st I, 93 9000griffin st II, 93 9000CSI, C900 LPT vert,
Others:73 Rover P6B (project) and 1 Suzuki GT380
rawill is offline Reply With Quote Quote 
Old 26-08-2012   #3
Join Date: May 2007
Posts: 661
Thanks: 18
Trader Rating: 0
rawill has donated!
New Zealand 
Re: brake pedal too long

After replacing the rear shoes because the adjusters were "unadjusting"
Then fitting new rotors and front pads, still no difference.
Then swopping proportioning valves, still no difference.
I mentioned to the mechanic that there was some fluid on the outside of the reservoir, I pumped the brake he checked, and you could see a little spout of fluid from the front piston.

I replaced the master cylinder and now he tells me my pedal is good.
I will get my WOF/MOT tomorrow when he opens.

However!!!!
A strange thing, there was a small "drain hole" under the master cylinder where it bolts to the booster. That let it have a vacuum leak, I plugged it with araldite over night and it was all good.

But what is this hole for, I notice on my other 84 70s it has the same hole, it is a newer master cylinder too. But it never leaked vacuum when I fitted it. I did not plug that hole.

Has anyone got an explanation.

Rbn
__________________
UNO 84-70s,
03 V6 Renault Laguna, SAABs 97 9000CD st I, 93 9000griffin st II, 93 9000CSI, C900 LPT vert,
Others:73 Rover P6B (project) and 1 Suzuki GT380
rawill is offline Reply With Quote Quote 
Old 27-08-2012   #4
Join Date: May 2010
Posts: 186
Thanks: 24
Trader Rating: 0
South Africa 
Re: brake pedal too long

the hydraulic calipers in the rear wheel that actuate the brakes are only about 10 pounds each, I'd get them replaced, the rubbers are just as tired as your break master's.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Hyperspace is offline Reply With Quote Quote 
Old 27-08-2012   #5
Join Date: May 2007
Posts: 661
Thanks: 18
Trader Rating: 0
rawill has donated!
New Zealand 
Re: brake pedal too long

Do you mean wheel cylinders for the rear brakes. I have rekitted them with new piston rubbers, about a $1.00 each.
__________________
UNO 84-70s,
03 V6 Renault Laguna, SAABs 97 9000CD st I, 93 9000griffin st II, 93 9000CSI, C900 LPT vert,
Others:73 Rover P6B (project) and 1 Suzuki GT380
rawill is offline Reply With Quote Quote 
Old 27-08-2012   #6
Join Date: May 2010
Posts: 186
Thanks: 24
Trader Rating: 0
South Africa 
Re: brake pedal too long

yes, them, sorry, english is not my home language.
I tried that route but the kit rubbers didn't last long, would have worked out cheaper for me, just getting them replaced first time around.

I did my caclulation wrong, was just under 6 pounds each.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides


Last edited by Hyperspace; 27-08-2012 at 21:23.
Hyperspace is offline Reply With Quote Quote 
Old 28-08-2012   #7
Join Date: May 2007
Posts: 661
Thanks: 18
Trader Rating: 0
rawill has donated!
New Zealand 
Re: brake pedal too long

No worries about the language.

I do my own work so I will be keeping an eye on them.
And maybe get some new ones and replace them anyway,
it is not a big job.

Thank you for your comments.

I have tried learning Italian, and Czech, so I have an idea of what having a 2nd language might be like.
__________________
UNO 84-70s,
03 V6 Renault Laguna, SAABs 97 9000CD st I, 93 9000griffin st II, 93 9000CSI, C900 LPT vert,
Others:73 Rover P6B (project) and 1 Suzuki GT380
rawill is offline Reply With Quote Quote 
Reply
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump
Similar Threads
Thread Thread Starter Forum Replies Last Post
(T) brake pedal deek Stilo 3 13-02-2012 18:29
(T) brake light switch and brake pedal dave Idea 2 21-08-2011 23:00
(T) New Panda 'long' brake pedal, Worry? gareth111278 Panda 2 04-12-2010 16:45
Why are Brake Pedal's higher than Accelerator Pedal's? MiniMonster Lets Talk FIAT 26 31-03-2010 00:21
(T) Brake Pedal tkmking Stilo 6 29-08-2006 09:35