Big brakes problems

Šubler

Šubler

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Hi,

I just installed 4 pot brembos on my S3, will my MC hold up fine? piston size is 40mm, all 40 of them. no braking power out of them and the pedal is so soft and only brakes when oat the end, very porly thou...

I bleede all 4 calipers couple of times, changed MC, and bleeded again but no luck, i cant successfully bleed ABS thou...

I dont know what to do...
 
I have RS3 4 pot Brembos on my mk1 TT. They are a 40 and 44mm piston and work fine. It's hard to bleed the system fully, are you using a vacuum bleeder or something like a Gunson eezibleed. I take it you have bled the master cylinder, the nipples on there are small so you need to be careful.
 
my MC does not have nipples on top... I used pressure bleeder i did try doing it with vacum too.
 
Šubler said:
Hi,

I just installed 4 pot brembos on my S3, will my MC hold up fine? piston size is 40mm, all 40 of them. no braking power out of them and the pedal is so soft and only brakes when oat the end, very porly thou...

I bleede all 4 calipers couple of times, changed MC, and bleeded again but no luck, i cant successfully bleed ABS thou...

I dont know what to do...
Click to expand...
Small 4 pot callipers are not enough for S3 because it is very heavy. My S3 is 1450 kgs, with full tank, and without sun roof. For perfect results, you need 360mm rotors, with 6 pot calipers. I have 4pot calipers (Hi-spec Monster 4) with 335mm rotor, and the brake result is not good enough... The best brake for S3 is Ap racing cp5555 360X32 rotors...
Cp5555bbk red main
 
I've got the Seat LCR 4 pot Brembo setup with 235 Michelin PS4s and if I brake too hard it'll lock up. I've got an S3 made by Audi, so probably similar to your really heavy one
 
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i need help with soft pedal not BBK advertising :p hehe
 
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Don’t mind him, he posted pictures of his brakes every day for the past week.

Back to the problem, you SHOULD have bleed nipples on the MC. Please post a pic if you can
 
Theo Pantazopoulos said:
Small 4 pot callipers are not enough for S3 because it is very heavy. My S3 is 1450 kgs, with full tank, and without sun roof. For perfect results, you need 360mm rotors, with 6 pot calipers. I have 4pot calipers (Hi-spec Monster 4) with 335mm rotor, and the brake result is not good enough... The best brake for S3 is Ap racing cp5555 360X32 rotors...View attachment 182477
Click to expand...
My S3 is 1451kg so I had to buy these:
2BBCF62F 0C17 41A9 A3BC 8171536F755F
 
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The actual brake caliper / disc is only half the story. The pads you fit in them are just as important. Yes the S3 is a lardy car but a 4 pot caliper with a decent size disc 330mm plus will provide all the stopping power you need on the road. If you have 4-500 bhp and track the car then that's a different story. But any serious track car will have had some weight pruned out of it.
I am confused why you don't have bleed nipples on the MC .
 
Bleed them with a pressure bleeder and VCDS if possible. I recently bled my B5 S4 with Brembo 18Z 6 pots up front and I couldn't get the pedal to firm up at all until I bled using VCDS. I wasn't even sure if I did it correctly or not, I just opened the nipples and bled each caliper as normal when the pump was on haha. Worked a treat. I could probably do with a second bleeding now, as it had been mostly drained of fluid as I sent be rear calipers off to get refrubed and the system leaked out all the old fluid over. The pedal feels 90% like it did before, but I reckon there might still be a pinch of air in it.

either way, VCDS or some other code reader that can do the same job might be worth getting a hold of to do the job.
 
If you let the lines bleed out during the install you will have to bleed the ABS module.

Where are you looking on the master cylinder? If you haven't bled it, it'll be downright dangerous.

3. What model 4 pots did you install? With what rotor?
 
I have MC without nipples, its this style here: https://cdn.autodoc.de/thumb/?m=1&id=8175918&lng=en&ccf=21876012

I have bleed them with pressure bleeder several times, i tryed using vcds and did like 10x ¨step on pedal --->relese pedal open bleeding screws-->press pedal 10 times, close bleedingg screws.....¨, its odes not work pedal is frist half of its travel very very soft and acts like nothing is there, at the very end there is some braking but very low power, cant even triger abs everytime...

Im using Brembo 4 pots, from Alfa Romeo, piston sizes are 40mm, all four. New seals too.
I changed MC.
disc are from cupra R mk1, so 323mm or 326mm i dont rly remember.

Also how many times you have to do the cycle ¨press pedal--->(abs pump goes on)----:release pedal, open bleeding scres---->(pump goes on for 10 sec)--->press pedal 10 times, close bleeding screws¨
 
audi upgrades
My Brembo calipers too have 40mm pistons and my pedal is pretty much perfect, very sharp braking force (also use the 323mm discs).

Abs pump can be a pain to bleed, fastest and easiest way I do mine everytime is to pressure the system and crank each union one at a time on the abs pump to bleed the air out. Works eveeytime for me and only takes minutes.
 
ben4866 said:
My Brembo calipers too have 40mm pistons and my pedal is pretty much perfect, very sharp braking force (also use the 323mm discs).

Abs pump can be a pain to bleed, fastest and easiest way I do mine everytime is to pressure the system and crank each union one at a time on the abs pump to bleed the air out. Works eveeytime for me and only takes minutes.
Click to expand...

can you walk me trough it on vcds pls? im lost totaly... can we go to private or maybe Facebook?
 
Šubler said:
can you walk me trough it on vcds pls? im lost totaly... can we go to private or maybe Facebook?
Click to expand...
Pressure the system with EZbleed or similar tool (to pressurise the system) then undo unions one at a time (the unions on the face of the abs unit) , there is no need for vcds this way.

Bleed fluid until no more bubbles come out. Can't explain better than that to be honest, it really is straight forward.

This isn't the official way to do it but it's the most effective for me.
 
ben4866 said:
Pressure the system with EZbleed or similar tool (to pressurise the system) then undo unions one at a time (the unions on the face of the abs unit) , there is no need for vcds this way.

Bleed fluid until no more bubbles come out. Can't explain better than that to be honest, it really is straight forward.

This isn't the official way to do it but it's the most effective for me.
Click to expand...

for unions u mean the output of abs to brakes?
 
will try this tomorrow, hope it works. What brakes are you using?
 
So are you bench bleeding the new MC before you install it? Or are you trying to bleed the entire system + MC after install?
 
OneiRacing said:
So are you bench bleeding the new MC before you install it? Or are you trying to bleed the entire system + MC after install?
Click to expand...
i installed it dry and tried bleeding all together, this was advised me from Audi service near me...
 
Problem SOLVED!!!!!

the issue was rear left caliper, the piston was 3-4mm away from the pad, and when you pressed the pedal in went soft until piston touched the pad, then it became hard( at the end of pedal travel) but there was no more room to press since the pedal was flat.... dont rly know what is wrong with caliper but new one is on its way, i ¨shimed¨ the piston and it does work great, nice hard pedal feel and good power.

Thanks to everyone thou!
 
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