Corsa brakes pants.

gixerboyuk · 13-12-2005, 16:33

This week has been spent mostly trying to sort the brakes on the car.
It is running a cav 256mm set up, basically the same as the bigger corsa brakes. But the pedal pressure is cr4p to say the least.

This has already been in a thread this week which i have read and someone mentioned the master cylinder, but on further investigation the master cylinder on the smaller brakes is one and the same as on the larger type.

In different guises they even have the same pads.

Are the cav calipers any larger than the corsa 256mm set up?

Have ordered a set of braided pipes, but its going to have to show a massive improvement to instill me with any confidence

. Pedal travel is way too much.

They have been bled time and time again, no leaks evident and yes the calipers are the right way up

On the off chance there is air in there, am wedging the pedal tonight and loosening the fluid cap

Any more suggestions for improving them?

It's none ABS btw.

corsacrock123 · 13-12-2005, 17:30

when i put the bigger cav brakes on my corsa i thought the discs looked about the same size, its when you look at the calipers and pads you see they are diiferent, there is a much larger brake pad area in contact with the disc.

on the brake preesure side of things i take it you have bled the brakes up, its best trying it with a friend, pump, hold pedal down and then release pressure from nipple, tighten back up and repeat, do this on the side furthest from master cylinder first.

hope this helps

gixerboyuk · 13-12-2005, 18:52

Quote:

Originally Posted by corsacrock123

when i put the bigger cav brakes on my corsa i thought the discs looked about the same size, its when you look at the calipers and pads you see they are diiferent, there is a much larger brake pad area in contact with the disc.

Thats not quite right though, a 93-95 1.6 corsa (model not specified) runs a 256 vented disc 2mm thicker an 7mm less offset than a cav, but uses the same pads that i'm using, which therefore has a same pad to disc area

aritchie · 13-12-2005, 20:50

ahaa the corsa break problem continues, I have a corsa xe with 1.4 master cylinder and 256mm Astra GTE disks and calipers and braided lines.

The break pedal is very poor and to make things worse I have problems with the balance as it wont adjust up enought due to ride height and lack of weight in the back, I chalange somebody to come up with a way of improving!

daveb948576 · 13-12-2005, 20:58

do you all no about the load sensing valve at the back of the car its on the right hand side just above the axle with a big sring on it

i accept the challenge lol

aritchie · 13-12-2005, 21:06

yeah i know all about the rear break load sensing valve hasnt helped me at all even with full adjustment!

I think finding a 22mm master cylinder that fits would be the solution but i dont know of one

daveb948576 · 13-12-2005, 21:10

with the load sensing valve you must wedge it open fully with a socket or similar when bleeding to get the flow going through properly.

aritchie · 13-12-2005, 21:15

Quote:

Originally Posted by daveb948576

with the load sensing valve you must wedge it open fully with a socket or similar when bleeding to get the flow going through properly.

interesting will get back to you on this but sounds promising

daveb948576 · 13-12-2005, 21:17

ive had the same problem you will kick yourself's after-wards LOL

htimsllib · 13-12-2005, 21:22

no corsa pad is the same as a cav 256mm one. the corsa/astra use the same pads, and big block astras/cavs run the same pads, but not corsa/cav.

htimsllib · 13-12-2005, 21:25

brakes on my mums are ****e and it's lowered 60mm, brakes went **** all of a sudden, the handbrake is also now poor, could it be that my stupid brother in law over adjusted the handbrake to make it look good and now the adjusters are ****ed? how do you adjust this brake valve?

aritchie · 13-12-2005, 21:27

Quote:

Originally Posted by daveb948576

ive had the same problem you will kick yourself's after-wards LOL

Im sure we did wedge it open when we bleed it but cant be 100% hope it sorts it as it doesnt feel safe as it is!

daveb948576 · 13-12-2005, 21:33

you dont adjust the valve it adjusts it self when driving you dont need to bleed do you so dont wedge it open just lift yours up and down a few times with a squirt of wd-40 to unseize it

it sounds like you will need to de adjust handbrake so it is on lots of clicks then unsieze the adjusters that are in-side the drums then refit everything apart from adjusting the cable then pump up the brakes with engine running but dont go anywhere ie chock wheel and keep pumping foot brake and keep lifting handbrake up and down intill you think that the pedal is feeling comfortable im pretty sure you have to pump foot hold it then lift handbrake then keep repeating until everything is feeling comfortable and then re adjust handbrake it looks a lot but is really straight foward once you have done it a couple of times.

when are you going to attempt it?

daveb948576 · 13-12-2005, 21:38

bleed in this order aritchie

check fluid level
open valve
passanger rear
check fluid level
drivers rear
check fluid level
passenger front
check fluid level
drivers front
check fluid level

do all of this three times just remember if you shake the bottle of brake fluid it creates air bubbles which as you no are no good. "do not shake"

then remove wedge and test drive if its still no good it could be another thing at fault ie abs pump or master cylinder is knackered

DutchNovaDiesel · 13-12-2005, 21:38

The master cilinder might be the problem, pre 97 RHD corsa's (or pre T 4336796 chassisnumber RHD corsa's) had that option

daveb948576 · 13-12-2005, 21:41

can you give us more info on that please DutchNovaDiesel

htimsllib · 13-12-2005, 21:41

asap i suppose! i thought he had over adjusted the adjusters(!) and stripped them? cos he's re adjusted them before?

Fadscorsa · 13-12-2005, 21:47

I've got this problem brakes are brand new (well two months old now) and they sometimes feel ok then some times they feel very vague and performquite poorly.....I've just bought some four pots and will be repacing the master cylinder for good measure

Just fed up of spongy pedal feel and lack of performance.

Oh and this is on an origianlly 1.4 16v sport

daveb948576 · 13-12-2005, 21:49

sounds like it hasnt been done properly "no dissrespect or nothing but these are brakes"

when you do them just reply to this post and we will try to give you as much help as poss when doing it its a shame your not closer to me as i would have done it for you for a

DutchNovaDiesel · 13-12-2005, 21:50

Quote:

Originally Posted by daveb948576

can you give us more info on that please DutchNovaDiesel

Just had a look in TIS, and it says:
"Brake pedal has a bad feel / to much travel" solution: new master cilinder

Problem solved for chassis numbers T 4336796 and up

D4VEW · 13-12-2005, 21:50

Quote:

Originally Posted by daveb948576

you dont adjust the valve it adjusts it self when driving you dont need to bleed do you so dont wedge it open just lift yours up and down a few times with a squirt of wd-40 to unseize it

it sounds like you will need to de adjust handbrake so it is on lots of clicks then unsieze the adjusters that are in-side the drums then refit everything apart from adjusting the cable then pump up the brakes with engine running but dont go anywhere ie chock wheel and keep pumping foot brake and keep lifting handbrake up and down intill you think that the pedal is feeling comfortable im pretty sure you have to pump foot hold it then lift handbrake then keep repeating until everything is feeling comfortable and then re adjust handbrake it looks a lot but is really straight foward once you have done it a couple of times.

when are you going to attempt it?

D4VEW · 13-12-2005, 21:52

Quote:

Originally Posted by daveb948576

then remove wedge and test drive if its still no good it could be another thing at fault ie abs pump or master cylinder is knackered

cars with abs don't have load compensators

daveb948576 · 13-12-2005, 21:53

well spotted

sxi andy · 13-12-2005, 22:40

id adjust rear brakeshoes correctly. i do this by grinding off drum lip and adjust out the shoes until with handbrake off you can just pass on the drum.they should be perfect then and give u good pedal feel so cylinders dont have to travel along way to put shoes on drums. also while ur there check the cylinders aint seeping or leaking as this will cause problems

gixerboyuk · 13-12-2005, 23:00

Quote:

Originally Posted by htimsllib

no corsa pad is the same as a cav 256mm one. the corsa/astra use the same pads, and big block astras/cavs run the same pads, but not corsa/cav.

1. Corsa https://sslrelay.com/buypartsby.co.u...?recordID=8648

2. Corsa https://sslrelay.com/buypartsby.co.u...?recordID=8649

1. Cav matching https://sslrelay.com/buypartsby.co.u...?recordID=8602

2. Cav matching https://sslrelay.com/buypartsby.co.u...?recordID=8544

Halfrauds part books show them shared as well