Urgent !!! Dba4000 + qfm hpx pads = not sitting correctly?

[Duk]

Hey guys!


I just installed a set of HPX pads with code DB1661HPX ( can anyone clarify these are the correct pads for MPS3 Front)?. The reason i ask is because, the pad is not sitting on the disc correctly.. About 8mm of the outer edge of the rotor is not in contact with the pad..... whereas the the inside of the rotor which is "greyed out" is in contact with the pad.. So essentially the pad is sitting approx 8mm towards the centre bore more then it should.

Please dont tell me this is normal. Because then my disc would eventually have a lip the size of 8mm?!



---------- Post added at 11:29 PM ---------- Previous post was at 10:55 PM ----------


More pictures of how the pad does not sit correctly.

[mps05]

I can't speak for part number etc, but i would think you have the wrong rotors rather than pads. If the pads fit into the caliper fine, they you would think they would be the correct pads. Seems the rotors are too big. Check the part numbers for them

[Duk]

Many pads can fit inside the caliper.. one half the size could fit in the caliper...And i've measured up the rotor, and cross checked the disc part number serveral times.. cant be wrong there

[Duk]

I have confirmed there is a defect with the pads.

[gslrallysport]

Ok, aside from the fact that we've sold near on 4 dozen of DB1661 pads now to suit MPS 3, I've also today checked the listings of Remsa, EBC, RDA and TRW, and all confirm that DB1661 is definitely the correct part number. So the only possibility now is the supplied pads are not DB1661 as per the box. I've gone through all those listings, all get the same cradle to pad height distance on MPS3 pads.

Could you please measure this distance, which is the cradle to top of pad material distance:


Are you saying the backing plate is a different size, or that the material doesn't cover the backing plate all the way to to the top?

Got any pics of the original pads?

We'll get this sorted. Has anybody else here had any dramas like this?

Regards,
Greg

[Duk]

Hi Greg,

Thanks for the reply. I'm not 100% if the problem is related to what i think it is. But its what i have circled on the left hand side, that notch in the backing plate is a fair bit deeper then the original pads, and it just so happens that difference in the two notches is the same amount that is not covered on the outer edge of the rotor. I cant find another reason as to why it would sit "in"towards the hub centre more apart from the difference in the how the deep the notch was cut into the backing plate.

Sorry i dont have any pictures of the original pads at this time, but the pads sent by you and the original pads, both look almost identical apart from that notch difference.




Regards,

Andrew


One other possibility i just thought of is that the retaining clips at the back of each pad is not in the right location...but then again i dont know why it is consistent with all four pads and not just the one.. At the end of the day.. the pad just isnt sitting where it should be

[gslrallysport]

Hi Andrew,

If you could measure that distance as shown when you get a chance that would be great. I'm not trying to compare the supplied pads to OEM, rather to what a DB1661 should be, given the large numbers of manufacturers that list it as the the correct pad, and also the large number of pads we've supplied previously to MPS3 in that number.

I'd happily supply you another set of HPX when available, or another brand such as Remsa, but I've looked at the listed pad for the later, and it matchces up exactly with what a DB1661 should be. Unless the supplied pads aren't DB1661, then there's some other issue. Are the pads correctly orientated, ie. the inner (as shown above) and outer pads are in the correct locations? Those notches are at best are a couple of mm, and don't explain the 8mm difference you've measured.

Let me know roughly what that measurement is and we'll take it from there. Also if you fire me through a photo of the supplied pads to my email that may also help.

Regards,
Greg

---------- Post added at 09:38 AM ---------- Previous post was at 09:33 AM ----------

One other possibility i just thought of is that the retaining clips at the back of each pad is not in the right location...but then again i dont know why it is consistent with all four pads and not just the one.. At the end of the day.. the pad just isnt sitting where it should be

The retaining clips on the back won't (shouldn't) determine the pad location, they're only there for noise suppression, and don't locate the pad at all. You'd be worried if the pads that are trying to arrest 2 tonne of deceleration were being held in place by thin metal springs. The pads, regardless of the clips, should be mounted solidly against the caliper carrier. Though saying that was what made me ask about the inner/outer pads being in the ride locations.

[Dark Authority]

Im the one who took DUK's HPX pads to try on my car.. i got the discs machined this morning..


Installation was 100% correct.. as you said.. it only goes in one way.. and all bolts were tighened correctly..

I can see its sitting ONTOP of the disc.. which is correct.. but there seems to be no contact when i brake..

Any explations.. i cant only see 1.. where the pad surface isnt completely flat... but it was..

[MPS Calipers, OEM FOMOCO stamped disced.. and machined.]

[gslrallysport]

Without seeing the car in person it's really hard to say much. If the pads is physically sitting over the rotor, but not contacting, then they just need more time to bed in. It's not an uncommon thing to have happen (although it's usually in cars with opposed pistons calipers).

When you say the rotors have been machined, was this before or after the pads were installed?