Rear Breaks LCR 02 - problem.

[olly_ed0088]

Hey,

I managed to get the back discs and pads on last night. I had problems with the piston, it was a sod to get back in even after opening the bleed valve.

However I have a problem now. The foot pedal goes down about twice as far as it did before. The hand break is nice and tight now as I would expect it to be with new, thick pads on so the calipers and pads are doing there job fine. I have sealed up the break fluid container in the bonnet and pressed the break pedal many times so that the break fluid pressure is up but still the pedal goes down to far.

There seams to be two levels of breaking. The initial pressure as you would expect then that fades until about twice as far down when the breaks respond as you would expect. I unscrewed the back left bleed valve to much and it fell off at one point, would this off allowed air to get in so that my problem is an air block? I am confident I did the bleed valves up tightly and I am not loosing any fluid, looking under the bonnet the level is the same and can’t see any leaks from the caliper.

I might take it down to quick fit and get them to change the fluid if that is what you guys recon it might be. Can’t be bothered to mess around in the rain and mud for the sake of about £30.


Ta
Olly

 

[Jonzy]

Did you use a wind back tool to wind the piston back in? Sounds like youve let a load of air into the system.

Take it to a professional (no offence), and get it sorted. Brakes aint something to be messed with unless you know what your doing.

 

[ibizacupra]

how did you go about actually bleeding the brakes... not that you had to touch the hydraulics to do disk and pad swap.

piston screws in for adjustment.. not just pressed back in like fronts.

 

[olly_ed0088]

No offence taken mate

I did screw the piston back in as I was aware that they are unlike the front.
I thought a load of air was a likely cause, do other people agree on that!?

not that you had to touch the hydraulics to do disk and pad swap.

The pads were worn right down so the piston was too far out to put over the new pads. I had to screw this back in and read about another member having to release some pressure via the bleed valve before he could get it going!?

Cheers for you help.

Olly

 

[Jonzy]

Perfect oppurtunity to change the fluid to some good stuff

 

[olly_ed0088]

Exelent, will do. Dont atcually think it has EVER been changed. There is no recored of it in the service book. GULLLLLP!

I have got a quote for a local garage "Treble B Tyre Services Ltd" for £59 using DOT 4 break fluid. Does that quote sound ok?

Cheers again...

 

[Jonzy]

Id say 60 quid is a little on the high side for labour and fluids.

I used to pay ford £25 labour and supply my own fluid (£20) - one job I cant stand doing is bleeding brakes.

 

[Ruddmeister]

DOT 4 break fluid...

You'll already have dot 4 in as standard so you could upgrade to either dot 5.1 or castrol superdot 4.....or Bill at Badger 5 does Motul stuff that he recommends

 

[ibizacupra]

The pads were worn right down so the piston was too far out to put over the new pads. I had to screw this back in and read about another member having to release some pressure via the bleed valve before he could get it going!?
Olly

Open bleed screw to allow piston back is'nt how it should be done.
pressure bleed the system, take the opportunity to put some decent fluid in (like Motul RBF600).

Beware of old fashioned pump pedal method of bleeding, as there is a risk of rolling the master cylinder seals and you will then need a new master cylinder which is a right pain in the ar$e job to do.

 

[ibizacupra]

Exelent, will do. Dont atcually think it has EVER been changed. There is no recored of it in the service book. GULLLLLP!

I have got a quote for a local garage "Treble B Tyre Services Ltd" for £59 using DOT 4 break fluid. Does that quote sound ok?

Cheers again...

As a ref. Motul RBF600 brake fluid (very high boiling temp) is £5.99/500ml +vat with approx 2ltrs for full bleed and some spare.

 

[olly_ed0088]

Cheers people,

Went down to the local Auto store and they normally stock DOT 5.1 but had run out so they only had DOT 4....... Will ask the garage if they have any 5.1 but if not will run with the DOT 4 (and lump the cost as I need it done badly) and then when I have my 40,000 mile service in the next 2000 miles I will get some ready for that.

Will let you know if that solves the problem! Fingers crossed I have not bu&&ered something else.

Ta
Olly

 

[olly_ed0088]

Cheers for you help peeps, I had the break fluid changed today and now they are 100% perfect! I forgot what good breaks feel like for a moment there! I am only using DOT 4 at the moment but will get that upgraded when it comes to my next service.

Ta
Olly