Brake Judder

Moderators: scimjim, erikscimitardemon, Lukeyboy46, Roger Pennington, philhoward

Post Reply
Mr Bridger
Posts: 366
Joined: Mon Nov 30, 2009 10:50 pm
Has thanked: 11 times
Been thanked: 10 times

Brake Judder

Post by Mr Bridger » Wed Sep 11, 2019 2:33 pm

My 5a has suffered from brake judder for quite some time now. It is felt mostly through the steering wheel.

I have:

Changed the pads & discs - an improvement for a while but the judder returned gradually
Overhauled the callipers - I had at least one lazy piston & hoped this would help; it didn't
Changed the suspension bushes - These seemed ok apart from the top shock bushes which had a bit of sideways play; made no difference
Checked the disc/hub mating surfaces for dirt/rust/anything which could throw the disc out
Changed the rear drums and shoes - I was clutching at straws by this point
During the work listed above re-torqued all the fasteners related to the front suspension and steering

The judder is least noticeable during very light or very heavy braking. It is worst during moderate braking and when the brakes are hot.

It does appear to be disc thickness variation, although the discs have only been on there for about 9000 miles, and a lot of those have been motorway miles. However, so far I've spent about £350 trying to cure this, and while I'm prepared to cough up another £80 or so for new pads & discs I don't want to do this if it's not going to sort the problem as I can't go on spending ad infinitum.

Anything else I can check before I get my wallet out again?


1975 SE5a - Daily Driver
1970 Triumph Vitesse
1972 VW Camper Van
1965 Sunbeam Tiger
1997 Mk1 MX5

User avatar
philhoward
RSSOC Member
Posts: 25143
Joined: Tue Aug 29, 2006 5:41 pm
Location: Staffs, UK
Has thanked: 58 times
Been thanked: 624 times
Contact:

Brake Judder

Post by philhoward » Wed Sep 11, 2019 3:14 pm

Hub bearings adjusted correctly?


Phil Howard
Scimitarweb Forum Admin
SS1 1600 Rooster Turbo; Sabre Mk1.5, Sabre Mk2
Previous: SE5/5a/SS1 No.1/SS1 Rooster/SS1 1800Ti/SE5a 24 Valve
http://www.ss1turbo.com
Never try and argue with an idiot. They drag you down to their level, then beat you based on experience.

Mr Bridger
Posts: 366
Joined: Mon Nov 30, 2009 10:50 pm
Has thanked: 11 times
Been thanked: 10 times

Brake Judder

Post by Mr Bridger » Wed Sep 11, 2019 3:20 pm

Yes, I should have mentioned that.


1975 SE5a - Daily Driver
1970 Triumph Vitesse
1972 VW Camper Van
1965 Sunbeam Tiger
1997 Mk1 MX5

Oldconn
RSSOC Member
Posts: 1638
Joined: Sat Aug 10, 2013 1:09 pm
Location: Haute-Saône,France
Has thanked: 60 times
Been thanked: 90 times

Brake Judder

Post by Oldconn » Wed Sep 11, 2019 3:26 pm

It could be that you have wear in the steering rack, or in the track control arms/track rod ends. With the front wheels off the ground, grip the wheel & tyre top and bottom and feel for any rock. If there is none , try again in the horizontal plane. If you have noticable rock in both planes, its probably the wheel bearings which are sloppy, but if there is more pronounced rock side to side, its likely to be in the track rod ends -and remember they have inner joints as well as the outer swivels. That's been covered quite recently on here.


"When I grow up, I want to be me"
-Kermit Weeks
Current: SE6A; 998 Mini.Previous: Morris Minor,Ford8, Cortinas Mk1 &2,MG Midget 1932,Morgan 3W 1934,Lagonda Rapier,Honda S800, Austin Maxi,Citroen GSA, Riley ElfMk2,Peugeot 505,Rover 420 SDI

User avatar
Old and Slow
RSSOC Member
Posts: 1086
Joined: Tue Jan 20, 2015 5:37 pm
Location: East Berks
Has thanked: 2 times
Been thanked: 52 times

Brake Judder

Post by Old and Slow » Wed Sep 11, 2019 3:41 pm

Here's a few ideas/red herrings:
Have you tried swapping the wheels around (front to back)?
Are the front dampers very old?
Can you see any discolouration on the discs where the pads have sat in one place for a long time?


Philip Needham
Ashley-bodied TR3; '54 Ford Consul; '55 AC 2-Litre Saloon;'65 850 Mini; '70 Ford Zodiac MkIV; XR3i
'81 911SC Targa, '64 Sabre Six

GTC Ian
RSSOC Member
Posts: 404
Joined: Fri Jun 24, 2011 10:50 am
Location: Whittlesey Cambs
Has thanked: 12 times
Been thanked: 5 times

Brake Judder

Post by GTC Ian » Wed Sep 11, 2019 3:44 pm

Have you checked your discs are not buckled? It doesnt take much to feel the effect. You stated you have a variation in disc thickness. By how much do they vary? You can also check that the disc is seated correctly on the hub ie no crap behind them ( the 2 mating faces) .


White GTC no 91 (Now getting the TLC it justly deserves)
Personal mechanic to Barbara's SS1
Previous SE5a JKG 236N (R.I.P)
Members since 1984

GTC Ian
RSSOC Member
Posts: 404
Joined: Fri Jun 24, 2011 10:50 am
Location: Whittlesey Cambs
Has thanked: 12 times
Been thanked: 5 times

Brake Judder

Post by GTC Ian » Wed Sep 11, 2019 4:02 pm

Just another thought. Did you overhaul your calipers after you fitted your new discs? If that was the case it could be the sticking caliper getting hot on the disc may have caused it to buckle slightly with heat soak . You say a lot of motorway use. Plenty of chance to get hot and then stopping , a lot of heat can transfer to the disc
in a small area when stationary.
Do you know anyone who works for an engineering firm who could spin your discs in a lathe to check for any runout?


White GTC no 91 (Now getting the TLC it justly deserves)
Personal mechanic to Barbara's SS1
Previous SE5a JKG 236N (R.I.P)
Members since 1984

halfpenny
Posts: 225
Joined: Sat Jul 09, 2016 7:49 pm
Has thanked: 12 times
Been thanked: 15 times

Brake Judder

Post by halfpenny » Wed Sep 11, 2019 4:21 pm

Borrow a different set of wheels/tyres - could be a tyre related problem



Mr Bridger
Posts: 366
Joined: Mon Nov 30, 2009 10:50 pm
Has thanked: 11 times
Been thanked: 10 times

Brake Judder

Post by Mr Bridger » Wed Sep 11, 2019 10:22 pm

Thanks guys, a few.more things to.consider there. I hadn't considered the steering rack
For all I know it is the original which means it could have done 200k + miles.


1975 SE5a - Daily Driver
1970 Triumph Vitesse
1972 VW Camper Van
1965 Sunbeam Tiger
1997 Mk1 MX5

Post Reply

Return to “Se5/5a”