Does brake fluid type affect pedal feel??

Black Sunshine · 11-04-2005, 01:07 PM

What fluid do all-y'all use?? I'm running motul 600 and am wondering if I should switch?

reefer_bob · 11-04-2005, 01:12 PM

11-04-2005, 01:15 PM

FixedWing · 11-04-2005, 01:15 PM

I personally have my doubts. Brake fluid is by design non-compressable.

Of course, that's barring boiled fluid as Reefer points out. :-p

Stephen

FixedWing · 11-04-2005, 01:17 PM

Plus it passes into a gas state at a much lower temperature (100C).

Stephen

Black Sunshine · 11-04-2005, 01:29 PM

I have new pads, new rotors, bled the fluid once, maybe I'll do it again. But they still feel a bit mushy under heavier load. Maybe audi just doesn't know how to get a firm pedal?

Any reason to cycle the ABS pump and all that jazz?

ryans4 · 11-04-2005, 01:33 PM

ryans4 · 11-04-2005, 01:35 PM

FixedWing · 11-04-2005, 01:40 PM

I did one bleed and they were ok. Then a few months later I replaced all of the fluid again. They were noticably better. I think there are some issues with getting all of the fluid replaced in the ABS unit. By bleeding, using, and then bleeding again you get new fluid into the ABS.

By the way, I'm using stock DOT4 fluid at the moment. It is fine for what I'm doing with these brakes at the moment.

Stephen

Black Sunshine · 11-04-2005, 01:40 PM

11-04-2005, 01:07 PM	#1
Black Sunshine AudiWorld Super User Account #: 22568 Join Date: Jul 2001 Posts: 4,052	Does brake fluid type affect pedal feel?? What fluid do all-y'all use?? I'm running motul 600 and am wondering if I should switch? __________________ "Gripping the wheel his knuckles went white with desire. The wheels of his Audi exploding on the highway like a slug from a 45. True Death, 400 horsepower of maximum performance piercing the night - this is Black Sunshine" 2002 S4 6MT AWE STG 3 - Still here, but not much longer 1995 S6 Avant Emerald/Ecru - Almost here, not much longer

11-04-2005, 01:12 PM	#2
reefer_bob Member Account #: 45294 Join Date: Oct 2002 Posts: 14,337	It can if it boils in the caliper, or if it's old and has water in it... __________________ Reefer_Bob. AIM: reeferbob R.I.P. Matthew Ammon aka O.W. Kenobi

11-04-2005, 01:15 PM	#3
NO.BRAZIL (barf) Guest Account #: Posts: n/a	I don't think water effects the feel of the pedal. Air, yes. Water, no.

11-04-2005, 01:15 PM	#4
FixedWing Senior Member Account #: 66531 Join Date: Dec 2003 Posts: 7,155	Some swear that racing fluid feels firmer... I personally have my doubts. Brake fluid is by design non-compressable. Of course, that's barring boiled fluid as Reefer points out. :-p Stephen __________________ ================================================== ======================

11-04-2005, 01:17 PM	#5
FixedWing Senior Member Account #: 66531 Join Date: Dec 2003 Posts: 7,155	It does. Water is much more compressable than brake fluid. Plus it passes into a gas state at a much lower temperature (100C). Stephen __________________ ================================================== ======================

11-04-2005, 01:29 PM	#6
Black Sunshine AudiWorld Super User Account #: 22568 Join Date: Jul 2001 Posts: 4,052	I'm still not happy with the pedal feel on my S4. I have new pads, new rotors, bled the fluid once, maybe I'll do it again. But they still feel a bit mushy under heavier load. Maybe audi just doesn't know how to get a firm pedal? Any reason to cycle the ABS pump and all that jazz? __________________ "Gripping the wheel his knuckles went white with desire. The wheels of his Audi exploding on the highway like a slug from a 45. True Death, 400 horsepower of maximum performance piercing the night - this is Black Sunshine" 2002 S4 6MT AWE STG 3 - Still here, but not much longer 1995 S6 Avant Emerald/Ecru - Almost here, not much longer

11-04-2005, 01:33 PM	#7
ryans4 Senior Member Account #: 4359 Join Date: Apr 2000 Posts: 7,314	stock brakes have crappy feel, but you may just need to do a better bleed... __________________

11-04-2005, 01:35 PM	#8
ryans4 Senior Member Account #: 4359 Join Date: Apr 2000 Posts: 7,314	old fluid has higher water "content" as well as boiled fluid... __________________

11-04-2005, 01:40 PM	#9
FixedWing Senior Member Account #: 66531 Join Date: Dec 2003 Posts: 7,155	I agree with Ryan.. I did one bleed and they were ok. Then a few months later I replaced all of the fluid again. They were noticably better. I think there are some issues with getting all of the fluid replaced in the ABS unit. By bleeding, using, and then bleeding again you get new fluid into the ABS. By the way, I'm using stock DOT4 fluid at the moment. It is fine for what I'm doing with these brakes at the moment. Stephen __________________ ================================================== ======================

11-04-2005, 01:40 PM	#10
Black Sunshine AudiWorld Super User Account #: 22568 Join Date: Jul 2001 Posts: 4,052	I'll try... that's why I got the bleeder! __________________ "Gripping the wheel his knuckles went white with desire. The wheels of his Audi exploding on the highway like a slug from a 45. True Death, 400 horsepower of maximum performance piercing the night - this is Black Sunshine" 2002 S4 6MT AWE STG 3 - Still here, but not much longer 1995 S6 Avant Emerald/Ecru - Almost here, not much longer

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