brakes pulsating query

[Phooey]

Ok ... for a while now the front brake PULSE when applying. This causes the front to dip and rise. Not too clever when braking hard. There is also a rythmic rubbing sound ... I'm thinking disc runout!

MOT passed with no comment on the brake which I thought a little weird. Anyway, I assumed the discs were warped so I got a mate to run his DTI on the rotors. Right disc runout was 3 thou and left disc runout was 2 thou ... Not that then! Calipers are solid with no movement that I can detect.

What do I look at next? This is doing my noodle now.

[TimR]

Stuck piston

Brake disk floating rivets loose

Headstock bearings loose

[Phooey]

Stuck piston

Brake disk floating rivets loose

Headstock bearings loose

 

All the above fine Tim. Plus the fact, wouldn't any of these highlight on MOT? Especially headstock bearing?

[Tango]

Deffo sounds like disk runout.......are you sure you've not got a sticking caliper piston.....and the caliper is floating ok?

Wheel bearings ok?

As TimR says.....check the disk bobbins are not too loose or sticking.......

[Phooey]

Deffo sounds like disk runout.......are you sure you've not got a sticking caliper piston.....and the caliper is floating ok?

Wheel bearings ok?

As TimR says.....check the disk bobbins are not too loose or sticking.......

 

I just ordered a DTI and i'm going to check the runout myself. Bobbins were cleaned a few months ago and are solid. Calipers were re-build when I upgraded them last year.

Haven't checked bearings but assumed it wouldnt get through MOT if bearings were gone.

[eastanglianbiker]

could it not also be the front tyre mis-shaped or a bulge or weak sidewall of tyre ?

[Grumpy Old Git]

Have you got ABS fitted (as part of your 'upgrade')?

[megawatt]

Disc is warped.

[Phooey]

could it not also be the front tyre mis-shaped or a bulge or weak sidewall of tyre ?

 

Brand new Pirelli's mate

[Phooey]

Have you got ABS fitted (as part of your 'upgrade')?

 

Sadly not GOG.