P38A Brake pad uneven wear

EntropyUK · Mar 24, 2018

Just took off my front brake pads on o/s front wheel and saw that one pad is significantly worn (outer pad) compared to the inner one. The slider looks a bit rusty so I think the sliders are the problem. Could some confirm this.

Also what's the best way to remove the seized offender as it is solid? Currently letting Plusgas soak in.

Nickpen · Mar 24, 2018

If the sliders are sticking you get more wear on the inner pad as thats the one the pistons push against, if your getting wear on the outer pad that suggests the inner pad is sticking in the carrier.
Take the pads out and look at the carrier where the lugs on the pads slide, it should be flat all the way across but in time the lugs on the pads can wear a grove which can stop them moving freely or they are rusted up, this makes one pad easier to push than the other so you get uneven pad wear.
Try cleaning them up but if its bad then its new carriers.
What's seized and soaking in plusgas?

EntropyUK · Mar 24, 2018

Managed to get the lower slider out with a set of mole grips working it loose after a soak with Plusgas. Now trying to get carrier frame off as disk is damaged.

biketeacherdave · Mar 24, 2018

The carriers are just a big lump of metal all they need is cleaning with a wire drill bit in your cordless drill, the sliders can seize up and cause most of the uneven wear you get. Its brakes let's face it they need to work well so maybe think about new discs, pads sliders and at a push calipers its 2.5 tonn motor there service items.

johnnyb70 · Mar 24, 2018

Perseverance with the right tool. When sliders seize they do cause uneven wear. I've had them snap off leaving the stub in the carrier a few times. So gently Bentley with plenty of heat.
I've had to drill from the back of the carrier get it red hot and punch it out. Drill a convenient size to tap then loctite a bolt in and cut off.
I'm now a fan of rubber grease on these sliders. Basically if the rubbers survive they keep sliding if the rubber perishes they seize in short order.

EntropyUK · Mar 24, 2018

Lower slider was really corroded so think that was the cause, but puzzled as its only 2 years since I paid a garage to change disks and pads.

@biketeacherdave - Calipers look OK and replacing disks, pads, sliders and all bolts.
@JonnyB - everyone says to use copper grease but I don't like it either. On my MX5 and this Rangie I have found the copper grease in a congealed lump and not really lubricating. I have read about using red grease but never had the bottle to try it.

biketeacherdave · Mar 24, 2018

EntropyUK said:
Lower slider was really corroded so think that was the cause, but puzzled as its only 2 years since I paid a garage to change disks and pads.

@biketeacherdave - Calipers look OK and replacing disks, pads, sliders and all bolts.
@JonnyB - everyone says to use copper grease but I don't like it either. On my MX5 and this Rangie I have found the copper grease in a congealed lump and not really lubricating. I have read about using red grease but never had the bottle to try it.

I use red brake grease not copper slip on all my cars and bikes

P38A Brake pad uneven wear

EntropyUK

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Nickpen

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EntropyUK

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biketeacherdave

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johnnyb70

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EntropyUK

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biketeacherdave

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