Brake noise after long ride, front and back

[marcusknight]

I went a long ride today. After about 120 miles or so including a bunch of city riding, I started hearing noises coming from both the rear wheel and the front wheel.

The rear wheel was bit of a hissy and almost pulsing rubbing sound. I especially heard this as I was pressing the brake pedal.

Later the front was making almost a pulsing squeak which I heard in first and second gear or when I would squeeze the clutch and coast. I avoided braking for a while the best I could and the front sound seemed to go away. Later I tried coasting down a hill in neutral with the engine off and I could still hear that hissing rubbing noise coming from the rear.

Are these sounds a normal reaction from the brakes after a bunch of city use on a warm day? Or is this more of a caliper sliding pin issue, or something else?

 

[zman]

It sounds like something is hanging up, you could check by taking it out when the rotors are cold and riding it a few/several miles without hitting the front brake then check to see if one or the other are warm, may take several miles, let it cool then use only the front brake to check the rear for heat.
Lubricity can effect the brakes, so can swelling piston seals.

 

[Ansimp]

Sounds like the rear mc is not releasing properly and causing the linked front and rear calipers to still apply some braking pressure :doh:

 

[aussiegold]

Ansimp » Thu Jun 04, 2015 10:00 pm[/url]":3omitqsi]
Sounds like the rear mc is not releasing properly and causing the linked front and rear calipers to still apply some braking pressure :doh:

that is a logical answer. well thought through, and makes perfect sense. :BigGrin: although the Zman has got me thinking on the lubricity . lubricity.... i like that word.. :clapping:

 

[Denver]

If calipers not free & lubed so they move freely, as well as pistons, they will get HOT!!!

 

[marcusknight]

The rear MC has separate brake lines for front and back so I would think that would not exclusively be the problem as there is a separate return for the brake fluid for back and front with the rear master cylinder.

 

[marcusknight]

Do rotors ever get warped or go bad in anyones experience? Could that be an issue here?

 

[Terry]

marcusknight » Today, 9:08 am[/url]":qoffxnj5]
Do rotors ever get warped or go bad in anyones experience? Could that be an issue here?

Yes they definitely can, I've had it happen on a sportbike.
But when a bike rotor warps you feel a strong pulsation in the lever when braking.

 

[slabghost]

A constant rub even slight will build heat in the caliper eventually heating the fluid in the entire system. This will expand the fluid some causing pressure to be applied to any calipers in the system. That will just increase the friction and heat in the system. That said. A certain amount of friction is expected as the pistons do not actually return. They simply release.