Question about 1997 Moto Guzzi Sport 1100 i

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1100 Sport i rear disc

The rear disc (brake) on my 1100 Sport injection seems to be running with a slight friction so that the disc heats up and eventually the fluid heats up enough to give brake fade. (Without even using the pedal.) I have since cleaned the calipers and lubed the pistons

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Topped-up the fluid and put in new pads. The wheel spins OK when up on the stand and the brakes don't jam or even seem sticky when you try them with the back wheel off the ground —ie: calipers grip and open again as they should. But on the open road the pads still seem to rub just enough to generate a warm to hot disc. (And the pedal has the right amount of play before the brakes come on.) Since working over the caliper and re-bleeding the brakes etc it seems a bit better (no fading) but it still runs a little warm to hot. I'm wondering about a complete service for the rear Brembo popping the pistons out and changing the seals etc but before I do (and I have to say it all looks absolutely fine as it is), is there anything else I should be looking at / thinking of? The disc seems true and unwarped. I know there's some anxiety about getting the right type of Brembo pad for the rear brakes on these particular bikes. Some are too thick? The parts book says Frendo FD 72 GG 222, (Guzzi part no: 27 65 46 10) and the caliper itself is marked 204531.03 if that means anything. (Is this the P32 type?) The pads I have are supposed to be the proper Brembo ones with the code 98.5031.50. Is there something I don’t know about this? ,FWIW this was a problem with some Sportis when they were new, to the extent that I saw a couple with completely smoked rear brakes, overheated due to brake drag. Mine never did it, so I don't know the root cause. In at least one of the instances I saw, the dealer replaced the entire brake system under warranty. There was a separate and likely unrelated issue with rear brake disks that were machined with a step in the middle of the pad's foorprint on one side. At the time, I heard people attributing the brake drag problem to the disk problem, but I can't see a correlation. ,,,

Posted on Nov 10, 2008

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