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Thread: Polo 6N1 rear brake problem proving difficult to solve

  1. #1
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    Polo 6N1 rear brake problem proving difficult to solve

    My wife's 1999 Polo 1.4 with drum rear brakes is in excellent condition for its age but has failed its MOT for the first time due to a non-functional footbrake at one rear wheel (handbrake is fine), despite replacement of flexible hoses, wheel cylinders and shoe assemblies in the recent past. I have made several attempts to resolve this (brake drums and shoes off, everything cleaned, linings and drums abraded, wheel cylinders checked for free pistons and no leaks, etc, all carefully reassembled and apparently working perfectly - adjusters pulled down manually with handbrake off and footbrake on) but to no avail. Persistently no effective footbrake at offside rear. Bleeding check released no air at all.

    Temporarily setting the load valve to maximum also had no effect but could this valve be faulty in a way to cause a problem on one side only? (I wanted to temporarily bypass the valve with flex hoses as a diagnostic check but seized pipe union nuts mean pipes will break and have to be replaced.)

    Please does anyone have experience or knowledge that can throw light on this problem? I am considering purchasing brake pressure test gauges but cannot find adaptors that would connect gauges to the 6mm x 1mm bleed ports of the wheel cylinders!

    MOT and tax now expired so have had to do SORN. Help please! Immobile wife!
    2018 Golf Estate SE BlueMotion 1.5 TSI EVO, DSG

  2. #2
    Administrator Crasher's Avatar
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    Yes the valve is dual chamber.

    https://www.eurocarparts.com/search/130440580

    Often you have to destroy the valve to get them off as the 58mm long steel bolts seize solid inside the ally body. If you attempt to change the valve, get two new bolts from VW before you start at 1.19 each part number N 10299503.
    2003 Skoda Octavia VRS Estate. APR 98RON remap, APR R1 diverter valve, Jetex exhaust, K&N panel filter, 7.5x18 Alutec Monstr wheels with 225/40 18 Uniroyal Rainsport 3 tyres.
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  3. #3
    Administrator Keithuk's Avatar
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    Why the hell do loads of member use stupid fonts and colours just to make a thread beats me as the normal font is perfectly expectable, all corrected.

    Happy New Year.
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  4. #4
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    Thank you, Crasher, that's helpful as I've been unable to find info on the construction of the valve elsewhere. Yes, I'm very aware of the issues with removing the valve - hence my desire to diagnose the problem before going down that path! Fortunately, on the Polo, one can unbolt the valve mounting bracket from the vehicle, so the bracket can be renewed as well or at lest separated from the valve off the car. I'll post again when I get the brake problem solved.

    Dear Keithuk

    I am extremely sorry to have unwittingly caused problems with font and colours, of which I was completely unaware. As you will have seen from a request in the Comments & Suggestions forum, I'd had problems with posting replies to threads, so followed the suggestion of another member of composing text outside of the forum and then pasting it in to the reply box. As I am working on an i-Pad, I used 'Notes' to compose my (simple black) text from where I pasted it to the forum. There would appear to have been an unwanted interaction between 'Notes' and the forum software, which has given rise to the colours and 'stupid' font. I certainly didn't select these and would never wish to cause any difficulty. All I can do is apologise profusely. If clarification of the recommended forum reply process could be provided, it might save both new members and yourself some frustration! Kind regards, Tony
    2018 Golf Estate SE BlueMotion 1.5 TSI EVO, DSG

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