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New pads on new discs - why so much drag ?
mstepien - 2/8/07 at 02:09 PM

Is it normal to have an enormous drag after putting new pads on new disks ? I have Wilwood Dynalite calippers with vented Capri disks and I had some real issues to put the pads to begin with and once they are there they cause an important drag on the wheel movement. Will this get better once the system is bled and pads bed in ?
Thanks for info.
Michal

BenB - 2/8/07 at 02:13 PM

Are the pistons screwed back (not needed on all calipers)? Have you cleaned the rustproofing wax off the discs? Are the calipers compatible with the (wider) vented discs?

If not, any of the above could increase resistance.....
.... could just be in need of bedding in though....

fesycresy - 2/8/07 at 02:22 PM

Possible cause is that your calipers are not centralised with the centre line of the disk. Have you fitted new Wilwoods at the same time ?

The pads will rub until bedded. Maybe the new pads are slightly thicker making the problem more noticable ?

HTH.

mstepien - 2/8/07 at 02:29 PM

The calipers are centered (to the extent possible for normal, careful measurement). Calipers are from the Capri kit, so they are built to accept the disk (they are not new but in good used condition). The only thing is that pads are not original Wilwood but EBC Greenstuff compatibles. Maybe they are slightly thicker thus resulting in drag. Once the "bedding coating" is removed I assume it should be better. I'll see how it develops over time. Thanks for info anyway.

Best regards,

Michal

fesycresy - 2/8/07 at 02:33 PM

Get the file out

02GF74 - 2/8/07 at 02:40 PM

quote:
Originally posted by mstepien
Is it normal to have an enormous drag after putting new pads on new disks ?


No.

Once you have applied and released the brakes, the pad should be off the disc to allow the wheel to spin freely (when jacked up) - you may hear the odd contact.

As you say, you had trouble fitting them in so it seems the gap between piston and disc is too small for the pads.

before you get intimaite with mr grinder and ms file, I would suggest undoing the bleed nipple then using a piston tool (or DIY two plates and bolts) to push pistons back in fully.

Then fit the pads.

If problem persists, then I don't know other than the caliper/piston/disc/pad combination being incomaptible.

(iit's not a case of having vented disc in calipers for solid - but then you would really have trouble getting the pads in!)

britishtrident - 2/8/07 at 02:55 PM

Master cylinder issue --- pedal push rod isn't allowing the piston in the master cylinder back far enough to open the port between the master cylinder bore and the fluid resevoir.

mstepien - 2/8/07 at 02:56 PM

The calipers are not bled yet. I intend to do it tomorrow if I find suitable hose for between master cylinders and the reservoir. I've put pads in already though to check if everything is ok. And it seems as it isn't but let's not judge too early.
Thanks and best regards,
Michal

Ivan - 2/8/07 at 05:47 PM

I had problems with greenstuff pads and found that although they felt loose enough in the calliper they where in fact too tight - a few seconds with a file removing some paint and a minute amount of metal solved the problem.