Shudders after braking??

jack1 · 23-01-17, 09:45 AM

Hi all,,Audi 100 c3 2.2 cd
Recently after driving for 5/6 miles I had to brake suddenly and when I started to build up speed from 40 onwards it started to shudder violenty,,it happened a week previous but wasn't as bad,,when I drove last time all was fine until I had to brake hard then it started???? Any suggestions please

Tun · 23-01-17, 11:16 AM

Sound like the pads need dropping out and the calipers given a good wire brushing. If there is a lot of dust build up/rust the pads can struggle to move back from the disc after heavy braking.

jack1 · 23-01-17, 01:16 PM

Quote:

Originally Posted by Tun

Sound like the pads need dropping out and the calipers given a good wire brushing. If there is a lot of dust build up/rust the pads can struggle to move back from the disc after heavy braking.

Could it be the discs warped?? Maybe

Tun · 23-01-17, 01:19 PM

Quote:

Originally Posted by jack1

Could it be the discs warped?? Maybe

My experience of warped discs is that they judder with any braking not just heavy.

jack1 · 23-01-17, 01:25 PM

Quote:

Originally Posted by Tun

My experience of warped discs is that they judder with any braking not just heavy.

That's the thing it does judder lightly around 60mph but once brakes are applied it gets more severe and continues to judder as I then accelerate,,if parked for a little while it's ok again till I brake again??

Colin Aitchison · 23-01-17, 06:50 PM

Just seen your post and two things cross my mind, you may have a slight warped discs that you may feel or not feel under normal braking and a semi-seized brake caliper piston or caliper sliders, from what you have said the juddering dose go away after a short time, you do need to strip down and service you brakes, you can do a simple test with a laser thermometer by driving the car have a go on the brakes to find the judder point, drive a little bit (200m) and stop, use the laser thermometer to find what brake has the highest temperature, that's the one that has a problem, you could use your fingers on the disc but I don't recommend it.

Tun · 24-01-17, 07:27 AM

Have you serviced the brakes recently?
A couple of years ago I re-assembled my front brakes after painting the front struts and under heavy braking would get a judder. When I stripped them down again I found a blob of paint (just a tiny bit) under the top hat of one of the discs which had kept the disc from sitting flat against the hub. Paint removed re-assembled and braking judder gone.

John. · 24-01-17, 07:48 AM

Quote:

Originally Posted by jack1

Hi all,,Audi 100 c3 2.2 cd
Recently after driving for 5/6 miles I had to brake suddenly and when I started to build up speed from 40 onwards it started to shudder violenty,,it happened a week previous but wasn't as bad,,when I drove last time all was fine until I had to brake hard then it started???? Any suggestions please

As above it's likely you have the start of a sticking brake, if you "catch it quick" so to speak, then you'll just have to deal with the actual issue.......leave for longer and you'll still need to sort the actual fault plus replace parts that will suffer due to excessive heat.
As Colin mentioned......use your infra-red-finger......you'll soon know!!...........or give it a run of a few miles making sure to use the brakes, then jack it up and compare how freely each wheel turns....or not.

23-01-17, 11:16 AM	#2
Tun Grown up member Classic Audi Club Member Join Date: May 2011 Location: Buxton Posts: 745	Sound like the pads need dropping out and the calipers given a good wire brushing. If there is a lot of dust build up/rust the pads can struggle to move back from the disc after heavy braking. __________________ 1988 MB quattro 2012 S4 Avant

24-01-17, 07:27 AM	#7
Tun Grown up member Classic Audi Club Member Join Date: May 2011 Location: Buxton Posts: 745	Have you serviced the brakes recently? A couple of years ago I re-assembled my front brakes after painting the front struts and under heavy braking would get a judder. When I stripped them down again I found a blob of paint (just a tiny bit) under the top hat of one of the discs which had kept the disc from sitting flat against the hub. Paint removed re-assembled and braking judder gone. __________________ 1988 MB quattro 2012 S4 Avant

23-01-17, 06:50 PM	#6
Colin Aitchison Senior Member Classic Audi Club Member Join Date: Dec 2013 Location: Back home in Tillicoultry Posts: 1,308	Just seen your post and two things cross my mind, you may have a slight warped discs that you may feel or not feel under normal braking and a semi-seized brake caliper piston or caliper sliders, from what you have said the juddering dose go away after a short time, you do need to strip down and service you brakes, you can do a simple test with a laser thermometer by driving the car have a go on the brakes to find the judder point, drive a little bit (200m) and stop, use the laser thermometer to find what brake has the highest temperature, that's the one that has a problem, you could use your fingers on the disc but I don't recommend it.