1989 90q judder when braking - Page 2

iconauto · 16-02-12, 11:32 PM

thats easy enough. i've already had them off to fit the new springs and i have two new strut inserts to fit this weekend as well. think i might just replace the top mounts anyway for what they cost. the slotted nut was tightened as well as the damper top nut. the bottom ball joints weren't touched because i have a policy of watching anyone who works on my cars. i even had to explain to them that there was no circlip on the bearings when they did them! i'll check the wishbone bushes as well while its in bits. i have a receipt for them being done about a year ago but you never know.

SteveT63 · 17-02-12, 12:24 AM

I'd be chucking a couple of discs at it as well, then I reckon you've covered the lot. Cheap enough, I think a Family Bag of Maltesers is more money than a a pair of discs these days!!

pimpdriver · 17-02-12, 06:57 AM

Quote:

Originally Posted by TeXerv

I suggest the discs. Sometimes things like that happen by coincidence

How do you check if brake discs are warped?

I think I have the same think on my B4 80.

Can I get one of these and check the unevenness?

http://www.ebay.co.uk/itm/Trade-Qual...ht_4205wt_1029

Cuppatea · 17-02-12, 07:36 AM

Using a dti yes, checking both sides of the brake disc as you turn it. Usually requires removal of the road wheel but the disc may come away from the hub slightly giving false readings but you can put the wheel bolts back in with some suitable spacers on them to help stop this from happening.

TeXerv · 17-02-12, 08:17 AM

Quote:

Originally Posted by pimpdriver

How do you check if brake discs are warped?

I think I have the same think on my B4 80.

Can I get one of these and check the unevenness?

http://www.ebay.co.uk/itm/Trade-Qual...ht_4205wt_1029

Of course, that's the tool you need. The unevenness must never exceed 2/10 mm (better less)

TeXerv · 17-02-12, 09:01 AM

Quote:

Originally Posted by Cuppatea

Usually requires removal of the road wheel but the disc may come away from the hub slightly giving false readings but you can put the wheel bolts back in with some suitable spacers on them to help stop this from happening.

This was very important to mention! And for reliable measurement, these bolts should be tightened with a proper torque. Not necessarily with the road wheel torque but evenly.

pimpdriver · 17-02-12, 10:05 AM

Cheers guys. Will buy one.

type81 · 17-02-12, 11:25 AM

When were the discs last changed? Is the judder felt through the steering wheel?

Not a definite or accurate way of measurment but....if you run your fingers over the brake disc right to the end/edge...if you can feel a ridge...its a sign that your discs are worn

pimpdriver · 17-02-12, 11:32 AM

Quote:

Originally Posted by type81

When were the discs last changed? Is the judder felt through the steering wheel?

Not a definite or accurate way of measurment but....if you run your fingers over the brake disc right to the end/edge...if you can feel a ridge...its a sign that your discs are worn

Bought 2nd hand. Off a CQ 20 valve. Fitted when did Girling 60 calipers, front top mounts and front wheel bearings.

Plenty of thickness left in them and looked in good condition.

Vibrations felt through steering wheel with light brake pressure.
Also you can feel it "gently pulsing" as I come to a stop.

type81 · 17-02-12, 11:46 AM

Second hand discs plus im sure you have done quite a few miles on em.....its going to be the discs.
For me....everytime a cars Steering/Brake pedal juddered.....it was always the discs.

17-02-12, 12:24 AM	#12
SteveT63 Senior Member Classic Audi Club Member Join Date: Sep 2008 Posts: 3,045	I'd be chucking a couple of discs at it as well, then I reckon you've covered the lot. Cheap enough, I think a Family Bag of Maltesers is more money than a a pair of discs these days!! __________________ Peace...........through superior acceleration! T85 1985 90quattro I5 20vT T81 1983 80 Sport Red T81 1983 80 Sport Silver

17-02-12, 10:05 AM	#17
pimpdriver Devon Pastie Muncher Classic Audi Club Member Join Date: Jul 2007 Location: Calne Wiltshire Posts: 7,530	Cheers guys. Will buy one. __________________ Winter tyres now! Driving the B2 80CL as a daily and LOVING it!!!!

16-02-12, 11:32 PM	#11
iconauto Grown up member Classic Audi Club Member Join Date: Oct 2011 Posts: 63	thats easy enough. i've already had them off to fit the new springs and i have two new strut inserts to fit this weekend as well. think i might just replace the top mounts anyway for what they cost. the slotted nut was tightened as well as the damper top nut. the bottom ball joints weren't touched because i have a policy of watching anyone who works on my cars. i even had to explain to them that there was no circlip on the bearings when they did them! i'll check the wishbone bushes as well while its in bits. i have a receipt for them being done about a year ago but you never know.

17-02-12, 07:36 AM	#14
Cuppatea Grown up member Join Date: Feb 2011 Location: Somerset Posts: 105	Using a dti yes, checking both sides of the brake disc as you turn it. Usually requires removal of the road wheel but the disc may come away from the hub slightly giving false readings but you can put the wheel bolts back in with some suitable spacers on them to help stop this from happening.

17-02-12, 11:25 AM	#18
type81 Senior Member Classic Audi Club Member Join Date: Nov 2009 Location: manchester Posts: 1,691	When were the discs last changed? Is the judder felt through the steering wheel? Not a definite or accurate way of measurment but....if you run your fingers over the brake disc right to the end/edge...if you can feel a ridge...its a sign that your discs are worn

17-02-12, 11:46 AM	#20
type81 Senior Member Classic Audi Club Member Join Date: Nov 2009 Location: manchester Posts: 1,691	Second hand discs plus im sure you have done quite a few miles on em.....its going to be the discs. For me....everytime a cars Steering/Brake pedal juddered.....it was always the discs.