Brakes Problem

[dom14]

keep bleeding, when i did new master, lines and reco calipers on my gq it must have taken about 3 litres of fluid before all the damn bubbles were out and i had a good solid pedal

Good to know that. Thanx mate.

[ugandasafari]

Brake and clutch servo share the same vacuum pump and accumulator. I have had days of brake head scratching only to find my clutch servo needed a kit. If you don't have a vacuum gauge you can stick your thumb over the end of each pipe in turn where it plugs onto the servo. If it doesn't hold vacuum check for pipe leaks back to the pump. Its usually the front clutch servo seal that goes. Always bleed your brake apportioning valve first. I'm under one of mine today with no rear brakes.

[dom14]

Brake and clutch servo share the same vacuum pump and accumulator. I have had days of brake head scratching only to find my clutch servo needed a kit. If you don't have a vacuum gauge you can stick your thumb over the end of each pipe in turn where it plugs onto the servo. If it doesn't hold vacuum check for pipe leaks back to the pump. Its usually the front clutch servo seal that goes. Always bleed your brake apportioning valve first. I'm under one of mine today with no rear brakes.

Welcome to the forum!

I've had no idea they both use the same booster.
It's apparently not the case with RB30, but I suspect TB42 & TD42 it is as above.

[Turtle_au]

Welcome to the forum!

I've had no idea they both use the same booster.
It's apparently not the case with RB30, but I suspect TB42 & TD42 it is as above.

Not same booster but a vacuum leak in one will effect the other.

Sent from my SM-T355Y using Tapatalk

[garett]

wait you guys have a booster on the clutch ? i must be the lucky one without it.

but if the booster is leaking you should feel the pedal "push" back if you hold the brakes on then switch off the engine.

[dom14]

wait you guys have a booster on the clutch ? i must be the lucky one without it.

but if the booster is leaking you should feel the pedal "push" back if you hold the brakes on then switch off the engine.

Vacuum Assist is the booster, is it?!

Booster leak means a vacuum leak, isn't it?

[dom14]

Not same booster but a vacuum leak in one will effect the other.

Sent from my SM-T355Y using Tapatalk

Yeah, I can understand. "Sharing the same booster" doesn't make any sense.

[garett]

Vacuum Assist is the booster, is it?!

Booster leak means a vacuum leak, isn't it?

yeah the booster uses vacuum to assist the work you do to push the pedal.
if the booster fails completely on a clutch makes the pedal like mine, booster fails on brake you have to push very hard on the pedal.
if i remember right the booster should hold a vacuum at rest. you push the pedal and you let air onto the diaphragm inside and the vacuum behind it sucks/pushes the diaphragm making it easier to apply pressure to the master. surely if you google it someone would have made a neat little animation

so yes it does mean a vacuum leak, but you could have other sources of leaks.

it should have a check valve as well so if the engine dies you still have a bit of vacuum left to stop.

[dom14]

yeah the booster uses vacuum to assist the work you do to push the pedal.
if the booster fails completely on a clutch makes the pedal like mine, booster fails on brake you have to push very hard on the pedal.
if i remember right the booster should hold a vacuum at rest. you push the pedal and you let air onto the diaphragm inside and the vacuum behind it sucks/pushes the diaphragm making it easier to apply pressure to the master. surely if you google it someone would have made a neat little animation

so yes it does mean a vacuum leak, but you could have other sources of leaks.

it should have a check valve as well so if the engine dies you still have a bit of vacuum left to stop.

I'm bit confused.
Does the clutch booster do the same thing as the brake booster?
Basically, making it easier to push the clutch pedal?
In other words, failing clutch booster means harder clutch pedal?

[garett]

yes dom they are the same just different sizes. ( not saying the are interchangeable just they work the same way)
but i would be surprised if a leaky clutch booster would affect the brake much. unless its a really big leak. never seen one i real life so speculating here.