SuzukiSavage.com - Print Page

SuzukiSavage.com
/cgi-bin/YaBB.pl
General Category >> Rubber Side Down! >> New Brakes Squeak
/cgi-bin/YaBB.pl?num=1376956554

Message started by Rush-rks on 08/19/13 at 16:55:54

Title: New Brakes Squeak
Post by Rush-rks on 08/19/13 at 16:55:54

When I got my bike last month I'm sure it still had the original front pads and they squeaked pretty bad. So I put on a set of EBC FA106 from all the threads I read on here and the squeaked stop.

Now after about 300 miles on the pads they are beginning to sqeak mostly on light braking when your hard on them no sqeak and it stops fine. When I installed them I put brake lube on the back of the pads, the rotor very smooth and shiny with only a slight uneven surface.

Take them back off and re apply anti squeak?

Title: Re: New Brakes Squeak
Post by WD on 08/19/13 at 17:03:20

That, and sand the rotor, light crosshatching with 100 grit. The rotor is glazed, very common with modern compound pads, they outgas something fierce and the gas + heat = squeaking and skipping. While the pads are out, file the leading edge down a bit at a 45 degree angle, it helps with the noise.

You only need to dull the rotor surface, don't go for big deep Xs. The pattern will allow heat and gases a channel to escape, helping the pads to bite into the rotor more firmly. Then you just need to give the sanded rotor and pads (sand them too while you are at it, it helps) a bit of time to bed in to each other.

The Savage caliper is very primitive, treat the brakes like you would late 60 and early 70s truck and muscle car brakes.

Title: Re: New Brakes Squeak
Post by Rush-rks on 08/20/13 at 06:10:32

Update:

Last night I went ahead and sanded the rotor got all of shine off of it now its like a satin finish I didnt pull the pads yet I could do this while in the garage while the Mrs. was ignoring me ;D like WD suggested.

Rode it to work this morning foggy damp misty and heard no squeaking so if it starts again will pull the pads and chamfor them and lube them again but hopefully problem solved :)

Title: Re: New Brakes Squeak
Post by Gyrobob on 08/20/13 at 07:37:24

Here's an excerpt from the thread on brake squeal in the tech section:

Brake squeal is something that can be controlled rather cheaply.

The squealing is from a resonance of high frequency vibrations in the pads/calipers when they contact the rotor. Because of the job the disc brake has to do, this squeal is common, even though the manufacturers' engineers probably tried hard to prevent it.

There are lots of ways to fix this. Replacing pads with lots of material left on them is not a sensible option,… a waste of money.

The idea is to change the resonance of the parts that vibrate, thereby pushing the resonance out of the range that creates a squeal. Here are some ways:

-- Simply wash the rotor and brake pads. Get them REALLY clean. If it works, it will probably have to be done occasionally to keep the squeak away.

-- Use the lube typically supplied with replacement pads. This is a high-heat lube that goes between the pads and the piston that changes the resonance frequency. Use sparingly.

-- Use that same lube on all the parts that support the caliper, allowing the caliper to move back and forth. Clean everything really well first, and, again, use sparingly.

-- I hear folks like Loctite, Permatex, CRC, etc., have sprays/pastes designed to fix the squeal, as well,... apply to the back of the pad, methinks.

-- Sometimes the pads, or even the rotors, can acquire a glaze that tends to make a squeal. Lightly scouring one or both surfaces can help here. Use 400 grit sandpaper (wet), or rubbing compound, steel wool, chore girl, comet cleanser, etc. You don’t want any scratches, just a satin finish. You might have to do this every few thousand miles with a particular combination of rotor and pads.

-- Chamfer the edges of the pads just a little, maybe a 1/16" wide chamfer.
--- Chamfering the leading edge of the pad is sufficient.
--- This alters how the leading edge of the pad tries to "dig in" to the rotor, changing the resonance frequency.
--- The squeal may come back in a few thousand miles as the pads wear down. Just chamfer it again.

-- Clean all the surfaces completely, then put a very thin layer of RTV on the back of the pad where it contacts the piston in the caliper. Also put a very thin layer on the surface of the piston that contacts the pad. Let it dry for a few hours before reassembly.
--- Very thin layer = Put a little on your finger, rub it on the surface, then wipe just about all of it off with a clean finger.
--- You don’t want any actual cushion here,…. that will make the brakes feel spongy. You want only enough to change the resonance of these two mating surfaces,.. just residue, not an actual layer.
--- Use something with a high heat capability. Normal RTV works,.. hi-temp RTV might be better. It's cheap.

-- Cut out a piece of coke can metal shaped like the back of the disc brake pad, and insert that piece between the pad and the piston. That metal is thin but is pretty tough stuff -- I use it for shims when aligning gyrocopter rotors. Sounds goofy, but it does change/negate the resonances, so it can eliminate the squeal.