I’m now part way through my annual service. The wheels are off and the brakes are stripped. Can’t detect any issues at the rear, slaves move freely, return fine too. All the pistons slide in and out ok at the front, disc wear is even and the pads have about 9mm on them.
Only tiny thing I’ve found when changing the fluid is a few small specs of muck in the brake fluid from the front right caliper. Fresh fluid all round now.
The weather is grim for the next few days so I’ll get on with the rest of the jobs and possibly get it out for a run after the weekend.
Have I found anything suspicious?, I don’t think so but time will tell. MOT due in six weeks. We must have some decent weather before then surely.
My money would be on a tyre to brake roller friction variance.
Tyre to brake roller friction variance is a critical factor in the accuracy of roller brake testers (RBTs), with measurements heavily influenced by tire pressure, vehicle weight, rubber condition, and roller surface roughness. Significant variance is introduced because RBTs measure total braking force which includes the resistance between the tire and the roller rather than just the internal brake components.
A Morgan is a very light car, so damn light in fact it's likely outside of the brake roller manufacturer's lower mass tollerance established when they designed the equipment, cars are much heavier these days so that's the standard they will have designed for. Find a friend with an equally well maintained car around the same curb weight as your Morgan, and put it on the same rollers, I bet it'll also show a similar inballance.
Anyway, you can always insist on a Tapley meter, Monty has an LSD so that's what I mandate. If you're testing the Sport Green 2012 Plus 4 in your profile you're a man of great taste as you have the same car as me, it would also mean you'll have an LSD so you really shouldnt be dropping the rear in the rollers as you'll cook your plates. In a clutch-type LSD, the wheel speed diferential creates intense friction and heat in the clutch plates as the LSD is doing its job by trying to lock the wheels together while the machine is forcing them apart.
You clearly have good mechanical knowlege and are maintaining your Morgan with great care, so please excercise your right to the Tapley meter as I'm confident you aleady know it makes sense
