Issue after fitting Brembo HC + DS2500

[-J-]

Ok Fitted new Brembo HC Discs and DS2500 last weekend. Since doing this a handling / Braking issue has become apparent.

Back ground - The car is a 172 Cup, On KW V2 Coilovers, 27k miles on the clock, Pads needed fettling to fit the carriers as DS2500's seem to need.
Pads / Discs were bedded in correctly (Cycles of 60 - 20mph)

The issue I am getting is, when Braking hard (Say 70mph hard Brake to 30mph) the front of the car is Diving on the drivers side, I am not sure if this is just the front Brakes loading up and this is "normal" as previously I ran standard Renault Discs and Pads and you were lucky if you stopped at all. The 2nd part of the issue is at 70mph plus the front of the car seems to pull a small amount right to left as it it is tram lining, but this happens in all 70mph situations on a variety of Motorways and dual carriage ways.


I am fitting rear Renault Discs and DS2500 pads this weekend, and think I will have to strip off the fronts again for a look, but I cant see it being a pad stuck as surely the car would pull to one side at all speeds?

Maybe its just coincidence that I did the Brakes and its something else?

 

[Tigger]

All cars should pull to the left ever-so-slightly at 70mph shouldn't they?

 

[Jamie86]

When was the tracking etc checked last?

 

[Tigger]

Should you need tracking checked after fitting new brakes?

 

[-J-]

Car was set up about 3 months ago when Coilovers were fitted

 

[-J-]

All cars should pull to the left ever-so-slightly at 70mph shouldn't they?

Mines off to the right (Drivers side)

 

[richy22]

Trackday

 

[mark123]

I'd say check that the pads are free to move in the calliper. Might need to file a bit more off, remember they expand when hot.

 

[Fred@BTM]

and also clean and regrease the slider pins

 

[-J-]

I'd say check that the pads are free to move in the calliper. Might need to file a bit more off, remember they expand when hot.

Thats a Good point actually, Had not thought of that.!

How "free" should the pads be in the Slider? When Cold I can put them in and they move freely, but I didnt take into account the "Heat Factor"

 

[-J-]

and also clean and regrease the slider pins

Daft question... Slider pins? Are they the little thin bits that the pads sit in on the front calipers?

If so i Copper Slipped them

 

[Tigger]

You can't forget the heat factor, baby!

XFAXILX

 

[Tigger]

The slider pins are where the caliper bolts screw into (rubber sleeve on them)

 

[Fred@BTM]

did you remove the pads shims? thin shiny metal things

the slider pins are the bit the wee 13mm bolts go into, you pull them out

 

[-J-]

did you remove the pads shims? thin shiny metal things

the slider pins are the bit the wee 13mm bolts go into, you pull them out

Ah I see, Did not grease them up... Will do that.

As for the Shims I presume that these are the Thin metal "brackets" that i think are made of Copper or something that sit at the top and bottom of the carrier?

If so No I didnt... Should i have?

Edit* these things? -

If so they are still on.

 

[Tigger]

Yes that's them ^ Take the shims out!

 

[-J-]

Hang on... These things?

If these I didnt Notice that there were any in there? Possibly stuck to the back of the old pads? Do i need them?

 

[Fred@BTM]

yeah they go in the bin (post 15) and you must file the ends of the pads down so you can move the pad vertically about 1mm in the carrier

i can 99% guarantee you have a binding issue

the plates in post 17 go in the bin too

 

[Tigger]

I didn't have the plates either, then again I didn't have much pad when I went to change them lol

 

[-J-]

Ah so thats where I went wrong i think!

i thought they were needed to hold the pads in... i will rip them off at the weekend and see who i go without them in! i presume there is a top and bottom one on each carrier?

i presume you just Pri them off with a Screw driver, then Copper slip the Carrier where the pads sit?

 

[Fred@BTM]

yup, but make sure you have a good 1mm of movement of the pads in the carrier, also make sure the spring on top of the pad is seated correctly

 

[Tigger]

I didn't even put any copper grease near my carrier/caliper or pads at all this time after being advised it can run/splatter when the brakes are hot.

Haven't had any problems with them so far and the braking is fine - fairly sharp I may add

 

[Dan R]

and also clean and regrease the slider pins

Defo!! Mine seazed up and i suffered the exact problem!!

 

[-J-]

Out of Interest, the Shims are i presume in the carrier to allow them to run smoothly, when the shim is removed is the caliper where its case not rough causing the pads to stick?

 

[Tigger]

Wire brush & brake cleaner for that before refitting

 

[Fred@BTM]

Out of Interest, the Shims are i presume in the carrier to allow them to run smoothly, when the shim is removed is the caliper where its case not rough causing the pads to stick?

nope