Car pulls under braking

[azzamut]

When braking hard the whole car goes broadside... As if ive lifted the wand! When i bought the car i was told the discs and pads were new... And to be fair the do look new. Could it be something to do with brake bias?

Thanks

[ns9900]

how fast are you braking from? i was on th M5 coming back, some knobend emergency broke,i followed and swung out. always happened to me and i'm told that its design flaw. may want to look into it further but my brakes n pads are 4000 miles in?

[azzamut]

Braking at relatively low speeds... 30mph or so. Car goes comletely broadside though lol. Surely not normal, i had a 306 Dturbo did the same thing mind you. Im doin a hill climb next month and dont really fancy coming off lol!

[ns9900]

yeh, im talking from about 60 n up. i'd get tracking done, possible bent wishbones, tracking rods, i mean have you lowered it? mines nose down, gets extra oversteer and even then, only swings its rear end out un braking from 60+. also, are you sure u dont jerk th wheel? even tiny movements will swing it considering all th weight moves onto th front and th rear end can do whatever it feels like doing

[azzamut]

Not lowered, no i dont jerk the wheel! Will have a look at it the underneath,,, its completely stripped out at the rear though.

[Psycho18]

I would have said tracking. A good garage won't charge you to check it and if it needs doing its a good thing to get done. Then take it from there.

[Ben8v]

do the back your wheels lock up? youve said it pulls under braking the said it goes sideways haha slightly different.... deffo have a look at your load compensator spray with wd40 and work it.

[Prickle]

how fast are you braking from? i was on th M5 coming back, some knobend emergency broke,i followed and swung out. always happened to me and i'm told that its design flaw. may want to look into it further but my brakes n pads are 4000 miles in?

*sigh

..

[Gandi699]

my money is on the brake vias valve under the nearside arch, chances are its seized or mal adjusted. Half the time they get so rusty sitting in road salt and crud that you cant adjust the screw in the spring, so I fitted a whole new valve. No more arse out sliding upon heavy braking, even with a car with nothing in the rear

[Marv_106]

Does sound like brake compensator.

Have you checked for play in rear beam also?

[tom_vts16v]

i had exactly the same problem a few weeks ago took it to my local garage put it on the brake rollers and nsf caliper way producing 40% less than the osf so changes the nsf caliper and it was still the same so changed the osf caliper which was ment to be the good 1 and its been fine since

[Mike_Roberts]

Yeah I'd say it's one of the front calipers. Take them off and clean up the calipers and sliders, and put a bit of copper grease on wherever it moves. It should help but if they're really bad then you may need to rebuild it or even get a new caliper.

[tom_vts16v]

i did the same i serviced calipers but made no difference mine had seen better days luckily i keep a shed load of spares but i would go with servicing first will save alot of ball ache in trying to get some

[azzamut]

Where is the brake compensator located? As said the guy i bought it off has fitted new discs and pads... But if the caliper is seized i presume this wouldnt make much difference.

My car has a hydraulic handbrake fitted if that would have anything to do with it!

[AlexB]

Being stripped wont help

Weight transfer and the fact both driver and engine are over right front wheel means these cars have a tendancy to pull to the left on hard braking

My gti is fucking aweful for it atm

A good way to stabilise it a bit i find is some good wishbone bushes front and rear

[axsaxoman]

Where is the brake compensator located? As said the guy i bought it off has fitted new discs and pads... But if the caliper is seized i presume this wouldnt make much difference.

My car has a hydraulic handbrake fitted if that would have anything to do with it!

this must be an ex rally car if it has hydraulic h/brake ,so its highlyunlikely that suspension is stdheight at both ends
take to mot station and get brakes checked --should be 80%front 20% rear as a strting point --presuming you apply same pedal pressure when testing front and rears independantly--do not just do a max brake test as they do for an MOT


once you have that info then you can make valued judgemnts
if suspension has been altered ,maybe rear torsion bars are in correctly fitted leaving little or no wieght on one rear wheel that wil cause the same thing to happen

[azzamut]

Yeah its dangerous the way it is at the minute. Is there a guide on how to adjust brake compensator?

[AlexB]

If you have an internal hydraulic handbrake id bet the oe compensator isnt there anymore

[Mike_Roberts]

If you have an internal hydraulic handbrake id bet the oe compensator isnt there anymore

I'll second that! No point in having a hyd HB if there's a compensator fitted. Bias valve need to be fitted before the HB.

[azzamut]

Anyone have any experience of the hydraulic handbrake and how to adjust it? Wilwood

[axsaxoman]

have you had it tested yet?
how do know its not the corner wieghts so far out ,or a sticky caliper --test first then look at adjusting if all else looks good
if backs give even readings--then its corner weights (torsion bars not equal --your bias will only control total rear end braking + you will see what that is if you test .
does car dive at front when braking or squat at rear?--that will be a clue as to bias

[luthor1]

I had a weeping CV boot once which was laying a fine amount of grease on the disc/pad one one front wheel, that caused this.

also - I don't mean to have a go, but why do people always say 'tracking' when talking about a car pulling or veering or swerving? Assuming equal caster and camber at the front, tracking defines the angle the front wheels are too each other. If you look from above, the front wheels could be parallel, they could be in the shape of a 'V' or toeing in massively.

either way, when you apply the brakes hard the 'tracking' will balance out 50/50 so the front wheels will be straight.

Tracking cannot have anything to do with a car pulling or veering! It's got to be castor or camber angles unless you are talking about rear tracking ( rear toe) because that's a fixed rigid angle to the car centre-line, but the front wheels (assuming even castor and camber) will always 'find the middle' when braking.

Just my 2p!

[azzamut]

It dives at the front and the rear seems to lock up straight away. Presuming thats due to lack of weight in the rear. Have a Wilwood brake bias adjuster ordered.