Talk Morgan Forums Morgan Sports Cars Maintenance & Servicing Brakes

My 2012 plus 4 stops very well on the road

When the MOT man puts it on his tester however the front brakes are always quite imbalanced, there’s about 30% difference between left and right. Yet on the road it pulls up straight and true.

My yearly maintenance involves removing both calipers from the hubs and gently easing each piston in and out and applying a tiny amount of rubber lube to the seals, cleaning off all residue. There’s no sticky pistons, no deformed discs and no contaminated pads. There’s no air in the calipers and all flexible pipes look like new.

I’m soon to start my annual maintenance process and wondered if anyone might have other suggestions I could add to my jobs list?

Thanks

Gary

Oh, can someone direct me to the correct brake pads for the Caparo calipers please? I went through this route this time last year, apparently the mintex compounds aren’t approved for road use! So I swapped the pads side to side with no difference to the mot results!

Sounds as though you are doing everything right. Try a different MOT tester.
P

If you look at the brake line layout for post June 1993 cars … with the Caparo brakes you’ll see the introduction of diagonally paired circuits.

Your problem is likely a leaking rear slave cylinder on the opposite side rear.

https://www.talkmorgan.com/ubbthreads.php/topics/787402/re-adapter-brake-fluid

Cain fitted the race pads to my car, never had a problem.

Interesting idea but the rear brakes balance almost perfectly and there’s no sign of any leaking inside the rear cylinders (part of my annual service routine).

But I’ll check again this year to be certain.

Given your comments the only thought I have is the calibration of his tester or the grip of each of your tyres on the rollers. As suggested try another test station.

Probably not the problem, but one of my original caparo callipers, despite being rebuilt was causing an imbalance. New callipers has solved the problem.
Think something in the manufacturer of the calliper.

I did wonder but yesterday I took the Z4 to him for testing and the results were balanced front and rear.

I’m wondering if these a possible link to the light weight of the Morgan?

I always fit these to the Morgan , be it sprinting or road use....
https://www.ebcbrakeshop.co.uk/products/ebc-greenstuff-2000-series-sport-brake-pad-set-dp2243

5% discount on 1st order

My experience is that the pads matter. Pads which need temperature won't heat up as much on a light car. It also matters how much of a braker you are. Mintex pads came with the ventilated disc kit for my Roadster, and gave me exactly this problem. On the rollers, balance was all over the place. On the road, it was evident for the first few seconds of application, then enough heat came in for them to work, but for my light use of brakes it didn't work. I went to Greenstuff, which were fitted whan I bought my Roadster on standard pads and no further issues. I realise that some hate Greenstuff. I also know that most find Mintex fine. For me Mintex did not work.