Hi.
Brakes soft from cold. Doesn’t change at all continues to be soft and spongy at all times.
Hard pedal gone. Haven’t had this since throttle body seals replaced.
Foot on brake. Start the car. Pedal used to move slightly. No movement at all now.
Loss of brakes
Re: Loss of brakes
What about this?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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steve2003rs6
- Top Gear
- Posts: 2434
- Joined: Mon Aug 19, 2019 7:43 pm
Re: Loss of brakes
Keep foot on brake pedal. Start the car. No pedal movement at all.
It used to move but not now.
It used to move but not now.
Re: Loss of brakes
And I'm assuming that if you keep your foot on it, it doesn't sink. Doesn't really sound like the master cylinder then.
I'm also assuming that when the calipers were replaced all the brake fluid was replaced, too. If not, then do that. In fact, do that anyway.
I sometimes buy some cheap stuff to purge with (eg. https://www.carparts4less.co.uk/p/pagid ... -524770271) before putting the good stuff in. Annoyingly you can't get coloured fluid any more so it's hard to tell when the cheap stuff runs out. Still, at 2 quid a bottle, you can afford to overshoot.
I'm also assuming that when the calipers were replaced all the brake fluid was replaced, too. If not, then do that. In fact, do that anyway.
I sometimes buy some cheap stuff to purge with (eg. https://www.carparts4less.co.uk/p/pagid ... -524770271) before putting the good stuff in. Annoyingly you can't get coloured fluid any more so it's hard to tell when the cheap stuff runs out. Still, at 2 quid a bottle, you can afford to overshoot.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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steve2003rs6
- Top Gear
- Posts: 2434
- Joined: Mon Aug 19, 2019 7:43 pm
Re: Loss of brakes
Yes new brake fluid at unit 20 this week.
Also with engine off. Pump the brake pedal and the brakes get firmer with less and less pedal movement with each pump.
Eg the brake pedal rises each time you pump it.
Also with engine off. Pump the brake pedal and the brakes get firmer with less and less pedal movement with each pump.
Eg the brake pedal rises each time you pump it.
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steve2003rs6
- Top Gear
- Posts: 2434
- Joined: Mon Aug 19, 2019 7:43 pm
Re: Loss of brakes
Engine off. Pump the brake pedal gets firmer and firmer until pedal is all the way up. Start engine and pedal does go down a bit.
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Banana man
- 1st Gear
- Posts: 62
- Joined: Tue Jun 19, 2018 11:24 am
Re: Loss of brakes
That sounds like normal, your using what vacuum is left in the system when pressing the brakes with the engine off, hence the pedal getting firmer, I do recall the pedal should sink slightly when engine is turned on whilst pressing the pedal as vacuum is built so basically the reverse of what happens when you have the engine off, but the fact you have servo assistance means the system is working.
I had a friend and he had loads of trouble with his brakes, it was a mk1 TT so same vintage as the c5, an ABS bleed with VCDS gave him pedal feel back, they said the fluid that came out the abs block was rotten, it’s apparently a two or even three person job as you have to activate the bleed with VCDS and open both front bleed nipples at the same time, I think they just done a side at a time though.
I had a friend and he had loads of trouble with his brakes, it was a mk1 TT so same vintage as the c5, an ABS bleed with VCDS gave him pedal feel back, they said the fluid that came out the abs block was rotten, it’s apparently a two or even three person job as you have to activate the bleed with VCDS and open both front bleed nipples at the same time, I think they just done a side at a time though.
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