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Gtir Motorsport club » Tech room » Help and Advice » Bloody brakes!

Bloody brakes!

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1 Bloody brakes! on 25th February 2014, 10:07 pm

Gaz GTiR

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Right guys need some serious help!

My brakes on my R have always been crap, Basicly I can stamp on the brakes to do an emergency stop & it just gradualy stops like your slowing down for a set of traffic lights, It wont lock up! Theres just no bight?
Its been like this for the 4 years ive owned the car & never managed to sort it no matter what I do or change? Ive tried 2 mastercylenders & a different servo & must of bled them atleast 70 times... Still never any better  Evil or Very Mad 

If I hit the pedal once it dousnt sink to the floor, BUT will go down further than if I let go & hit the pedal a 2nd or 3rd time... Its like it pumps itself up the 2nd / 3rd time I pump it to slow down...
BUT if I press it to hard the pedal feels solid like I hits a stop half way down & wont go any further??? That's the scary part, feels like the pedal hits a brick wall & cant push threw it?

Its like a preasure issue? even tho ive changed mastercylender & servo... Still the same?

Could this be a proportion valve issue? Even tho im getting good flow thew all calipers when bleeding?


I need to sort this now as its been 4 years ive put up with it & had to do an emergency stop the other night & luckily managed to swerve the car infront & ended up sitting next to him on the wron side of the road  Mad 

2 Re: Bloody brakes! on 25th February 2014, 10:14 pm

GTI-R US

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Management
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have you tried changing the pipe from servo to plenum?

I doubt it will be the proportioning valve


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3 Re: Bloody brakes! on 25th February 2014, 10:15 pm

Gaz GTiR

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Yeh the 1 way valve pape? changed that aswel mate :/

I have got the fuse out of the abs as I hate abs. But I hear a lot of people do this so I don't think that would be the issue?

4 Re: Bloody brakes! on 25th February 2014, 10:29 pm

GTI-R US

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Management
Management
no that wont be the prob

really cant think of anything else gaz other than servo and master which you've changed

I would have said try a different set of brakes but if it was doing the same thing before it cant be those either

only other possibility is a kinked or blocked brake line somewhere.
what ever it is its no doubt a problem mainly on the front brakes so considering its already had 3 different servos and masters I guess the only thing left is the proportioning valve, perhaps its restricting the flow to front but unusual as they are diagonally proportioned


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5 Re: Bloody brakes! on 25th February 2014, 10:35 pm

Gaz GTiR

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Im getting a good flow of fluid to each caliper when bleeding so that rules out a kinked pipe i reckon?

The car dousnt pull under braikingm its perfectly strait, But just no bight & strange how pedel hits a stop halfway down?

Could it be a fault with the ABS pump, even tho its not working coz fuse is out, fluid still has to run threw it so wonder if that's the fault?

6 Re: Bloody brakes! on 25th February 2014, 10:43 pm

GTIR James


Try bleeding to abs pump ie crack the pipes at the pump then bleed to calipers. Any chance you could get it on a brake rollers so you can see brake readings etc.

7 Re: Bloody brakes! on 25th February 2014, 10:58 pm

Gaz GTiR

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Ill try it james. Do i crack them off on the abs pump then pump the pedal & lock them off when fluid comes out & the re bleed the callipers as normal?

8 Re: Bloody brakes! on 25th February 2014, 11:00 pm

johnny gtir

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moderator
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What calipers disk n pads you currently running ?

9 Re: Bloody brakes! on 25th February 2014, 11:06 pm

Gaz GTiR

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Wilwood calipers & 285mm discs, unsure on pads, but pads wouldn't cause a stop on the pedal like theres a preasure issue?

10 Re: Bloody brakes! on 25th February 2014, 11:09 pm

GTIR James


@Gaz GTiR wrote:Ill try it james. Do i crack them off on the abs pump then pump the pedal & lock them off when fluid comes out & the re bleed the callipers as normal?

That's it gaz crack them, pump pedal.
Had this ages ago on a nissan cabster. Shocking brake pedal & air was stuck in the abs pump. Some manufactures even say to activate abs when bleeding......

11 Re: Bloody brakes! on 25th February 2014, 11:17 pm

Gaz GTiR

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Ok cheers James Smile

Crack them 1 by 1 & start at the pipe that leads to furthest caliper & work my way in?

12 Re: Bloody brakes! on 25th February 2014, 11:29 pm

nomad

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Admin
Admin
Cant you just loop it and take the pump out altogether if you think it maybe suspect and your not using it anyway ?


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13 Re: Bloody brakes! on 25th February 2014, 11:32 pm

gtirnick


probably not the solution you're looking for, but i had a similar problem with the factory brake setup.
i switched to 4pot wilwoods and 280mm discs and it improved considerably but i still had abs a very long pedal and the car felt like it wouldnt stop once abs kicked in.
i would bleed the brakes often and the pedal would still remain long.

i ended up removing abs completely (kept the abs prop valve) and adjusted my brake lines to suit as well i switched up to a 1inch master from an altima. my pedal is now firm, short, and lock up is easy to induce when i want it too.

14 Re: Bloody brakes! on 26th February 2014, 12:15 am

Gaz GTiR

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Yep got to be something to do with abs pump... I may do that Leighton/nick, ill need to change the prop valve for a none abs one. How hard is it to get to? i heard its a inlet of job?

15 Re: Bloody brakes! on 26th February 2014, 1:14 am

gtirnick


16 Re: Bloody brakes! on 26th February 2014, 1:39 am

Gaz GTiR

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Cheers nick, is that photobucket link actulay a GTiR diagram? so id need to plumb it all the same as the pic?

17 Re: Bloody brakes! on 26th February 2014, 12:19 pm

Scooby_killer

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I have the same problem as you gaz I've changed the master cylinder, de glazed all discs and pads and still giot the same problem as you shit brakes

18 Re: Bloody brakes! on 26th February 2014, 12:53 pm

Gaz GTiR

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Not just me then, Im going to try bleed abs pump at weekend so ill let you know. If you solve the problem let me know lol

19 Re: Bloody brakes! on 26th February 2014, 5:04 pm

gtirnick


i followed it as reference, but i just followed the lines from the master to actuator to prop valve and just traced the lines that way.

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