Rally Car Brake Upgrade Help

[McCann 0]

Hello I was wondering could anyone give me some advice as to any brake upgrades that can be done without buying expensive AP or the likes discs and calipers. I am running a 205 rally car with a built 1.9 and 1.6 box shafts and hubs. At the minute it is standard master cylinder, bendix calipers 1144 pads and grooved discs but I would like something better, I have heard of people using 406 master cylinders and brembo 2 pots off a 406 coupe? Is this a straight bolt on job? Can anybody shed any light on this cheers

[welshpug 1,655]

http://www.205gtidrivers.com/articles.html/_/articles-guides/brakes-suspension-steering/205-front-hub-differences-what-brakes-fit-etc-r87

 

basically, you're stuck to whatever 247mm brake caliper with those hubs and discs, unless you fit base model hubs, or 1.9 hubs and shafts.

 

Personally i;d stick to 1.9 calipers and good pads, or save up for 106/saxo cupcar AP's.

[c_robinson 8 1 Cars]

i run a non lightened standard 1600 205 on 1900 hubs, shafts and calipers with 1155 fronts and mintex 1144 rears and have happily outbraked escorts with more money tied up in their brake set up than my cars worth. Get good calipers, 1155's on standard discs and AP 600 (not cheap) fluid and you'll be fine

[mikeyd 13]

base model hubs to keep 1600 shafts and then 1900 brakes or 306 266 mm discs/ calipers [just need to grind caliper slightly if staying on 14 inch rims !]

[FireFly 4]

306 GTi6 283mm front brakes can be found for £40~£60.

[McCann 0]

But when using bigger a discs the caliper is going to be offset further from the centre of the hub so this is going to change pedal feel unless a master cylinder out of a 306 gti6 is fitted?

[welshpug 1,655]

no, pedal feel is affected when you alter piston diameter, generally the pedal will feel the same however large your disc is if the pistons are the same size.

[McCann 0]

Sorry for the silly questions as I'm sure yous boys have done a lot more experimenting with brakes than I have but if I keep my standard 1.6 bendix calipers would using a mc from a car with a smaller piston diameter exert more braking force for less pedal force?

[welshpug 1,655]

• When you are talking master cylinders:

 

Smaller = MORE pressure, but LONGER pedal.

 

Bigger = LESS pressure, but SHORTER pedal.

 

 

• Bigger Pistons

(or a larger surface area from more pistons)

 

Means more pressure but without upping your master cylinder bore you will get a longer pedal, though the difference is marginal with oem calipers unless you have a 19mm MC fitted.

 

Do bear in mind that 4 pots don't always have a larger surface area, their main advantages are that they are stiffer and lighter.

 

 

• Bigger discs

 

means more leverage, and usually higher heat dissipation capacity, but higher likelihood of locking.

 

 

 

 

All a friend of mine has done on his Tarmac 1.6 (stock engine other than bolt ons) Is fit Yellowstuff pads, Race fluid, from memory also a standard 20.6mm Master cylinder, an inline bias valve and standard 1.6 rear end.

 

Probably one of the best braking setups I've experienced in a 205, because it was part of a package of Bilsteins Yoko's and a Diff, as these also help.

[McCann 0]

Thanks for the good advice I think I will just change mc (as its weeping anyway) and see what difference that makes