Spongy Brake Pedal
Forum rules
Many subjects will have been discussed before. Please try the search function before starting a new thread.
Check in the Know Your 2 as the information you need may already be there.
Important ! - Please make your topic title as descriptive as possible . titles with just "help" generally dont get as many answers as a title that points to the problem
Many subjects will have been discussed before. Please try the search function before starting a new thread.
Check in the Know Your 2 as the information you need may already be there.
Important ! - Please make your topic title as descriptive as possible . titles with just "help" generally dont get as many answers as a title that points to the problem
-
Topic author
Spongy Brake Pedal
Hi all, i hope you can help me because i am loosing my mind!!!
Just fitted new disks, pads, calipers and braided lines to my rev 2 NA, i have bled the brakes to high heaven, no more bubbles. The pedal is hard when engine off, engine on and the pedal goes to the floor. Im assuming this is due to servo assistance. Any ideas?
Im guessing its master cylinder? but i cannot find a new replacement....
Many thanks
Just fitted new disks, pads, calipers and braided lines to my rev 2 NA, i have bled the brakes to high heaven, no more bubbles. The pedal is hard when engine off, engine on and the pedal goes to the floor. Im assuming this is due to servo assistance. Any ideas?
Im guessing its master cylinder? but i cannot find a new replacement....
Many thanks
-
- Posts: 2683
- Joined: 13/08/07 13:06
- Years of MR2 Ownership: 12
- MR2's Owned: 2
- Real Name: Pete
- Gender: Male
- Location: Stratford upon Avon
- Has thanked: 2 times
- Been thanked: 11 times
Re: Spongy Brake Pedal
how long was the system dry for? sels can dry out and not recover.
how are you bleeding?
if you dont do both fronts before rears or both rears before fronts you can get into airlock issues.
2 of you (1 brake pedal 1 on bleed nipple) or using a pressurised bleed system .
feel like its not bled correctly. but guessing here
how are you bleeding?
if you dont do both fronts before rears or both rears before fronts you can get into airlock issues.
2 of you (1 brake pedal 1 on bleed nipple) or using a pressurised bleed system .
feel like its not bled correctly. but guessing here
Highland Drive 13/14/15/17/18/19
JAE 07/09/10/11/12/13/14/15/16/17
Japfest 09/11/12/13/16/19
Wales runs 14/15/16/17/18
-
Topic author
Re: Spongy Brake Pedal
Hi mate, it was dry for about a month,
2 man method, am 100% sure that i am doing that right
2 man method, am 100% sure that i am doing that right
-
- Posts: 64
- Joined: 26/11/12 23:25
- Years of MR2 Ownership: 1
- MR2's Owned: 2
- Real Name: Paul
- Gender: Male
- Been thanked: 1 time
Re: Spongy Brake Pedal
The fact that the pedal is alright without the engine running means you probably still have air in the system.
Some times you just need to leave it for a while (air saturated in fluid) best to leave overnight.
Buy a pressure or vacuum bleeder they will save you a load of time and trouble.
Pressure bleeder is better but vacuum is almost as good and easier to use.
Some times you just need to leave it for a while (air saturated in fluid) best to leave overnight.
Buy a pressure or vacuum bleeder they will save you a load of time and trouble.
Pressure bleeder is better but vacuum is almost as good and easier to use.
Re: Spongy Brake Pedal
I had trouble until I used a pressurised system. I think the handbrake mechanism contributes to the problem
-
Topic author
Re: Spongy Brake Pedal
Thing is, i took it into a garage and had them use a master bleeder on it, ended up getting no air out in the end, system fully bled over an hour yet the problem persists!
-
- Posts: 848
- Joined: 29/01/11 18:53
- Years of MR2 Ownership: 9
- MR2's Owned: 1
- Real Name: Jan Olsson
- Gender: Male
- Location: Leicester
- Been thanked: 1 time
Re: Spongy Brake Pedal
Try bleeding with the engine running.
Rear left, rear right, front left then front right.
Check all the unions disturbed when fitting the brake lines top and bottom.
If the problem persists it may be that you have goosed the mater cylinder. The theory is that when 2 man bleeding you get to put your foot to the floor which can run the internal seals on part of the chamber that doesn't normally see wear. So this is rough/corroded and may damage/ flip a seal.
Rear left, rear right, front left then front right.
Check all the unions disturbed when fitting the brake lines top and bottom.
If the problem persists it may be that you have goosed the mater cylinder. The theory is that when 2 man bleeding you get to put your foot to the floor which can run the internal seals on part of the chamber that doesn't normally see wear. So this is rough/corroded and may damage/ flip a seal.
1991 rev 1 T Bar n/a 3sge import. A work in progress!!!
-
Topic author
Re: Spongy Brake Pedal
What would bleeding with the engine on do differently?
Yeah i am thinking master cylinder... no idea where i would get one though haha!
Yeah i am thinking master cylinder... no idea where i would get one though haha!
-
- Administrator
- Posts: 5164
- Joined: 17/05/04 1:00
- Years of MR2 Ownership: 18
- MR2's Owned: 1
- Gender: Male
- Location: Glenrothes: The Kingdom of Fife
- Has thanked: 45 times
- Been thanked: 116 times
- Contact:
Re: Spongy Brake Pedal
If that was the case then how is it holding a firm pedal with the engine off ? Have you tried the brakes on the road ? (very carefully )abovetherim wrote: ↑10/12/18 19:46 If the problem persists it may be that you have goosed the mater cylinder. The theory is that when 2 man bleeding you get to put your foot to the floor which can run the internal seals on part of the chamber that doesn't normally see wear. So this is rough/corroded and may damage/ flip a seal.
-
- Posts: 848
- Joined: 29/01/11 18:53
- Years of MR2 Ownership: 9
- MR2's Owned: 1
- Real Name: Jan Olsson
- Gender: Male
- Location: Leicester
- Been thanked: 1 time
Re: Spongy Brake Pedal
jimi wrote: ↑10/12/18 21:14If that was the case then how is it holding a firm pedal with the engine off ? Have you tried the brakes on the road ? (very carefully )abovetherim wrote: ↑10/12/18 19:46 If the problem persists it may be that you have goosed the mater cylinder. The theory is that when 2 man bleeding you get to put your foot to the floor which can run the internal seals on part of the chamber that doesn't normally see wear. So this is rough/corroded and may damage/ flip a seal.
Could be that only one seal is damaged and that the undamaged one gets hard enough to to hold the pedal but with servo assist it pushes a little more to feel the damaged one.
I have seen this once on a Capri and we diagnosed as one caliper was not moving at all off the pedal
1991 rev 1 T Bar n/a 3sge import. A work in progress!!!
-
- Posts: 848
- Joined: 29/01/11 18:53
- Years of MR2 Ownership: 9
- MR2's Owned: 1
- Real Name: Jan Olsson
- Gender: Male
- Location: Leicester
- Been thanked: 1 time
Re: Spongy Brake Pedal
If you want new then give tcbparts a call or general eBay.
If you happy with used then post a wanted as here or imoc or on the book of face if you are part of that.
Where are you? I know someone in Leicester that may have a used one stashed.
1991 rev 1 T Bar n/a 3sge import. A work in progress!!!
-
- Posts: 1298
- Joined: 19/02/12 15:27
- Years of MR2 Ownership: 10
- MR2's Owned: 3
- Real Name: JAMIE
- Gender: Male
- Location: WEST SUSSEX
- Has thanked: 4 times
- Been thanked: 17 times
Re: Spongy Brake Pedal
I have a good used one if you are near west sussex .
MK2 3sge Uk sold.
MK3 Chilli red sold.
MK2 Smg Gltd Super Edition now with V6
MK3 Chilli red sold.
MK2 Smg Gltd Super Edition now with V6
-
Topic author