Brake bleeding with ISTA+ on R56 w/ DSC
#1
03-24-2020 | 07:39 PM
Thread Starter
|
3rd Gear
Joined: Mar 2019
Posts: 181
Likes: 43
Brake bleeding with ISTA+ on R56 w/ DSC
Ok, this is driving me crazy. I know, brake bleeding is hard, but I'd like some input from someone who did that successfully before.
So after I had pretty bad brake fade at my last track day at Laguna Seca and almost exited the track in turn 5, I decided it's again time to flush brakes. Just flushed maybe 3 track days before with ATE Type 200.
Eventually, I did: Rebuild rear right brake caliper (rubber was cracked). Probably got some air into the brake line.
Then I did:
* Flushed approx. 1.3 liters of ATE Type 200 through the system (started rear right, then rear left, then front right, then front left) using a Motive Power Bleeder at about 1 bar.
After that:
* Brake pedal nice and hard when engine is off. Turned on engine, and pedal basically went to the floor.
Me: Great. Air in the DSC unit.
Got ISTA+ working again on my laptop, then ran through the DSC Brake Bleed instructions (I would count the flushing that I did as pre-bleeding).
* For every corner, it first activates the valves, then I push fluid using the power bleeder through the lines (again, at approx 1 bar) for the 60s.
Did that for all 4 corners according to instructions.
But again, soft pedal after starting the engine.
I then did some random activation of valves with INPA and it got a bit better, but still from perfect (in my humble opinion).
Questions:
* How much fluid do you push through the system for each of the corners (especially after a caliper rebuild)?
* Did you successfully perform brake bleeding with ISTA+?
* To what pressure did you pump up your power bleeder?
Should I expect the same firmness with engine off as with engine on? Maybe I'm just chasing the white rabbit.
Cheers,
Philip.
So after I had pretty bad brake fade at my last track day at Laguna Seca and almost exited the track in turn 5, I decided it's again time to flush brakes. Just flushed maybe 3 track days before with ATE Type 200.
Eventually, I did: Rebuild rear right brake caliper (rubber was cracked). Probably got some air into the brake line.
Then I did:
* Flushed approx. 1.3 liters of ATE Type 200 through the system (started rear right, then rear left, then front right, then front left) using a Motive Power Bleeder at about 1 bar.
After that:
* Brake pedal nice and hard when engine is off. Turned on engine, and pedal basically went to the floor.
Me: Great. Air in the DSC unit.
Got ISTA+ working again on my laptop, then ran through the DSC Brake Bleed instructions (I would count the flushing that I did as pre-bleeding).
* For every corner, it first activates the valves, then I push fluid using the power bleeder through the lines (again, at approx 1 bar) for the 60s.
Did that for all 4 corners according to instructions.
But again, soft pedal after starting the engine.
I then did some random activation of valves with INPA and it got a bit better, but still from perfect (in my humble opinion).
Questions:
* How much fluid do you push through the system for each of the corners (especially after a caliper rebuild)?
* Did you successfully perform brake bleeding with ISTA+?
* To what pressure did you pump up your power bleeder?
Should I expect the same firmness with engine off as with engine on? Maybe I'm just chasing the white rabbit.
Cheers,
Philip.
#2
03-30-2020 | 11:15 AM
3rd Gear
Joined: Oct 2007
Posts: 244
Likes: 30
From: Small town BC
I have just done a brake fluid flush on my 2012 R59 and flushed about 1 and a half litres through the system with no problems.
I did it the old fashion way with 2 people and pumping brake pedal and opening and closing bleed screws.
Was very careful to not let any air in the system.
I started at right rear then left rear, right front then left front.
I did it the old fashion way with 2 people and pumping brake pedal and opening and closing bleed screws.
Was very careful to not let any air in the system.
I started at right rear then left rear, right front then left front.
Thread
Thread Starter
Forum
Replies
Last Post