Odd noise

Greetings gentlemen,
I took out this 1972 e-type yesterday and something was wrong. This is one of those models with the awful in-boarded & caged-in rear brakes
which are impossible to get at without dropping the rear axle out. Anyway, in this particular case I'd had all the brakes done anyway: new disks, pads, refurbed calipers etc etc and thought it timely to take it out for a road test. Seemed a bit hesitant when flicking between forward and reverse; something inertial like the brakes were binding a bit (that's how it felt anyway). Didn't seem to want to free-wheel much on slight gradients. On speeding up, there was this pronounced clonk, clonk, clonk noise from the n/s rear which I immediately thought was due to loose wheel nuts so I anchored up promptly and checked, but they turned out to be fine. At 2mph this sounds like more of a grating than a clonking and seems to be in sync with the speed of the road wheels. Any ideas what this might be? It's done 60k miles.
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If this has the Dunlop brakes, spares are fiendishly expensive, so perhaps the calipers weren't fully overhauled with new piston assemblies. May also be a problem with the hardbrake.
Lift the car and try turning the wheels by hand to see if a brake is binding.
Think later ones went over to Girling. I'd expect spares for those to be easier/cheaper.
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Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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On Sun, 25 Mar 2018 15:46:44 +0100, Dave Plowman (News) wrote:

With both wheels off the ground, *something* certainly is dragging, whether it's the brakes or not I can't say, but since they've just been done by a very reputable outfit, I'm not so sure it would be that. Noticeably more resistance to hand-turning on the near side as against the o/s. I'm wondering if a bearing might have broken-up. Think I'll run it in gear with the wheels off the ground and have a listen around the entire rear end with a hosepipe. Can't go wrong with a hosepipe IME. :-)
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On Sun, 25 Mar 2018 15:46:44 +0100, Dave Plowman (News) wrote:

I remember running a red light at Pembury about 40 years ago. I put my foot on the brake to stop, but it went to right to the floor and I carried on going! I had no choice but to run the lights but fortunately I got away with it as there were far fewer cars on the road back then. Later I recounted what had happened to an old timer mechanic and he said, "Oh, well, Girling brakes." Funny thing was, that was the *only* time it ever happened with that car and I never found what the issue was with it. Weird!
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The Rover P6 had a similar brake layout to the E-Type. And that changed over from Dunlop to Girling fairly early on in its life. The rear calipers were a swing design with integral handbrake mechanism. Worked extremely well. But not totally fit and forget for ever. Needed a strip clean and lube once in a blue moon.
I well remember an early 2000 where the cost of replacing the Dunlop piston assemblies caused the car to be scrapped. Unlike a cast iron calliper, the piston bodies were made of something which wore out quite quickly requiring total replacement rather than just new seals.
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