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Author Subject: squirrelly braking, uneven rear suspension the cause?
jimmyhackers

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Location: birmingham

Registered: 14 Jun 2011

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Post #1
under hard braking...my car feels a little unstable like it wants to pull to one side, push harder and one wheel will lock up before the others and it will slide a little to one side.

front discs and pads are fine.
did the rear pads today and all was in order...seemed weird as i didnt have to re-adjust the handbrake. problems still there though

my rear suspension has about 10mm difference in height when on the axle stands and its closer to 5mm when on the ground.

obviously my rear torsion bar's setup wrong....but is that likely to cause the said squirrelly braking issue im having?

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Posted 22nd Feb 2025 at 16:51
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gnrlee Forum Admin

Location: Leeds

Registered: 20 Aug 2005

Posts: 8,883

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Post #2
Hmmm
Could be but if not defo get that sorted anyway,..
I'd be looking at a sticky piston,..
If you have a split boot water gets in causes corrosion and doesn't allow the piston to move as freely therefore one piston would press against the disc harder and cause the pulling,..

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Posted 23rd Feb 2025 at 08:12
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Joep

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Location: Urmond (The Netherlands)

Registered: 19 Sep 2013

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Post #3
Subframe bolts loose? That happened to me once.

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Posted 23rd Feb 2025 at 21:34
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jimmyhackers

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Post #4
toight as a tiger..... Smile

went and got a wheel alignment done today. maybe some data will illuminate things.

before was....
overall front toe -0.51, LH toe -0.28, RH toe -0.23
LH front camber -0.19, RH front camber -0.46

rear toe, LH +0.01, RH 0.00
rear camber LH -1.17, RH -1.28

caster difference 0.51, LH bar is 100%, RH bar is at 49%

after adjustment
overall front toe +0.20, LH +0.10, RH +0.10
LH front camber -0.41, RH front camber -0.27

all the rear values and caster remain unchanged.

i find it weird my front camber values have essentially swapped sides after only a minimal adjustment to the track rods, ideas or thoughts about this?

also the rear camber difference...the side that is lower has 0.11 more/less. does rear camber increase/decrease the lower you set the rear suspension, or is this a sign of a worn torsion bar swing arm bushing or something else broken?

i mentioned the rear suspension height difference to the mechanic saying after i fix that ill have to come back and get it done again. His opinion seemed to be, it wont matter and save yourself some money. again, thoughts?

thanks for the help Smile

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Posted 1st Mar 2025 at 14:34
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Joep

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Post #5
Sounds like worn rear axle to me. Might cause “crabbing” which I can imagine will make the car feel like it is going one side when braking.

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Posted 2nd Mar 2025 at 07:17
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jimmyhackers

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Post #6
hmm.... the car does feel a bit better after the alignment. less pull under braking but still not perfect.

finally swapped my spare steel wheel for an alloy and its 4kg lighter. So the low sides ever so slightly less low now Big grin not sure how much that effects things.

i imagined the difference in rear height will effect the rear camber slightly, which is why its uneven atm. but looking at the numbers....i would of expected the lower side (RH) to have less camber than the other.

maybe that side is buggard Sad

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Posted 2nd Mar 2025 at 20:32
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jimmyhackers

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Post #7
GNRLEE WAS CORRECT!!! TEN POINTS!!

sticky brake piston on the passenger front side. thing got so hot today it melted the brake wear sensor plastic into goop.

went to get new front discs from GSF today, left phone there like an idiot.
got home, realised i left my phone there, went back.
got home again, realised they were the wrong disc, 266mm instead of 283, went back again for refund.
turns out they dont stock gti6 disc ffs.

sometimes im an idiotSmile

ended up just puttting new pads on the old discs after some wd40, cleaning, grease and love.
was somewhat crusty on the carrier/pad interface surfaces. driver side piston i could push in by hand...passenger side...needed some wd40 love and a caliper winder tool to free up.

plus side....things seems ok now.
i can still notice the rear suspension height being out but the brakes feel better/even now.

thanks again!!

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Posted 8th Mar 2025 at 16:39
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Joep

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Post #8
Maybe better to take the whole brake apart as well. If the brake was not working correctly due to a piston being stuck, I would not be surprised the slider pins have corroded.

Clean the slider pins and fit with plenty of grease (lithium grease for example). WD40 is no lubricant suitable for brakes.

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Posted 9th Mar 2025 at 08:30
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jimmyhackers

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Post #9
i did the slider pins a few months ago. Big grin
new pins n re-greased with lithium grease. one was seized on that side but they are good now.

i went through the whole saga of ordering two sets of 2nd hand front brakes, to find one slider pin hole has 0.5mm of play and the other 0.1mm in every set, and its by factory design/error :S

the car had been sat for about 10 years in a scrap yard before i got it a year ago. ive been fiding/fixing lots of things that have been seized due to lack of use.

the passenger electric window has never worked since i got it but the other day it decided to unstick itself and start working again Razz

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Posted 9th Mar 2025 at 09:02
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Joep

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Location: Urmond (The Netherlands)

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Post #10
I need that luck with the window… fitted a new mechanism, just to stop working two weeks later. I hear a “click” but then nothing happens…

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My car park:
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Posted 10th Mar 2025 at 15:29
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