Bedding in new brakes

dr al · Post by **dr al** » Thu Feb 01, 2007 4:47 pm

nice brakes!!!

there's quite a good descrition of bedding in proceedure on the Seloc wiki.

basically - 10 mins normal driving, the brake gently from 30 to 10mph 3 or 4 times to warm the pads up
Then do repeated runs of 70 to 30 braking consecutively in as quick succession as you can, not stopping the car in between, and on the last one come to a complete stop and shove the brake pedal as hard as you can, holding it there with cramp in your thigh for at least 2 minutes.

I did it for my new mintex pads a couple of weeks ago. - eaglesham moor is quite handy for it, but i did get a few funny looks from pedestrians!.
love that smell of toasty brake pads!

A.

mac · Post by **mac** » Thu Feb 01, 2007 5:38 pm

That's the procedure recommended by Nick Adams too - I know there are other schools of though but that the one I follow.

Mac

Rich H · Post by **Rich H** » Thu Feb 01, 2007 6:31 pm

Still not a fan of holding red hot pads against red hot discs for any length of time. The theory is that it compresses the pads while they are hot but I hate to think what stresses you could be setting up in the disc. I would miss out the compression stage for the sake of the discs IMHO.

This is purely from a materials point of view and my professional opinion as a Carphone Whorehouse part-trained phone monkey.

Scottd · Post by **Scottd** » Fri Feb 02, 2007 12:57 am

RICHARDHUMBLE wrote:Still not a fan of holding red hot pads against red hot discs for any length of time. The theory is that it compresses the pads while they are hot but I hate to think what stresses you could be setting up in the disc. I would miss out the compression stage for the sake of the discs IMHO.

This is purely from a materials point of view and my professional opinion as a Carphone Whorehouse part-trained phone monkey.

Yea sounds fine without the 2 minute hold at the end. My discs are slightly buckled without doing that!

robin · Post by **robin** » Fri Feb 02, 2007 8:21 am

I think it's been shown before that disk warping is often really uneven pad transfer to the disk and not actual warping.

In the scale of things, 2 minutes is no time at all.

The disks marshall huge forces all day long, so I would be surprised if this procedure did them any harm, but there you go.

Cheers,
Robin

alicrozier · Post by **alicrozier** » Fri Feb 02, 2007 9:27 am

I take it from the pic they are Pagid RS4-2, you might want to get them a little hotter (higher start speed).
From memory bedding in RS14s they recommend 110-30...which would be interesting in traffic on the A90 going to Kames (even at 5am)...

Victor Meldrew · Post by **Victor Meldrew** » Sun Feb 04, 2007 3:24 am

I was hoping to be doing the bedding in this weekend, still waiting....

SteveBanks · Post by **SteveBanks** » Sun Feb 04, 2007 6:33 pm

Scottd wrote: Yea sounds fine without the 2 minute hold at the end. My discs are slightly buckled without doing that!

ROBIN wrote: I think it's been shown before that disk warping is often really uneven pad transfer to the disk and not actual warping.

See, I already told you that but oh no you won't listen

Scottd · Post by **Scottd** » Sun Feb 04, 2007 7:01 pm

SteveBanks wrote:
Scottd wrote: Yea sounds fine without the 2 minute hold at the end. My discs are slightly buckled without doing that!

ROBIN wrote: I think it's been shown before that disk warping is often really uneven pad transfer to the disk and not actual warping.
See, I already told you that but oh no you won't listen

Yea but Robin knows wot he's talkin about

robin · Post by **robin** » Sun Feb 04, 2007 8:54 pm

Actually in this case just hearsay (though it was Fergus who told me, so reasonable source) - I have never had any warped disk problems, probably because I don't actually go fast enough to need the brakes much

Cheers,
Robin

Post by **simon** » Sun Feb 04, 2007 9:15 pm

alicrozier wrote:you might want to get them a little hotter (higher start speed).

Normal start speed I've seen quoted is 90 tuts but I guess they poofed out of suggesting people drive fast on the wiki

Post by **campbell** » Sun Feb 04, 2007 11:02 pm

I'm sure there's a bedding in guide supplied with Pagid pads in the packaging, resembles the procedure quoted but I have never done the "hold for 2 mins" thing.

The various sets and combos I've put together over the years have always worked well as a result. Or perhaps not, who knows

Best advice I can give is...fit 'em, then drive down your fave road for an hour taking no prisoners

<BG>

Tom · Post by **Tom** » Mon Feb 05, 2007 11:51 am

John Reid wrote:I was hoping to be doing the bedding in this weekend, still waiting....

tell me about it. i've got new discs and old pads on the front, waiting for pagids, and still to do the rear discs, hopefully by saturday coming i'll have them all on and be bedded in nicely.........

Rich H · Post by **Rich H** » Mon Feb 05, 2007 6:35 pm

Bed in discs and pads separate if possible. Get them fitted to the rears and let them settle down then bed in the pads. Its better for everything that way.

Tom · Post by **Tom** » Mon Feb 05, 2007 7:08 pm

RICHARDHUMBLE wrote:Bed in discs and pads separate if possible. Get them fitted to the rears and let them settle down then bed in the pads. Its better for everything that way.

you mean bed the new discs to the old (slightly wonky) pads, and then change the pads?? front and back??

what is the prob with bedding in both new??