Bled the brake reservoir empty, what next? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Top Gun · 05-31-2020, 05:05 PM

Installed a front BBK with stainless steel lines and I accidently let the reservoir go empty. We kept bleeding and bleeding and there were still some micro-bubbles. I eventually eventually ran out of brake fluid and started to re-use some of the brake fluid as it was clean. I had 3 32oz bottles. The pedal is stiff but not as stiff as it should be.

Do I need to bench bleed the master cylinder? I was thinking of bleeding all 4 brakes with 1 gallon of brake fluid.

Code Monkey · 05-31-2020, 07:30 PM

New rotors and brake pads? Go and bed-in the brake pads first and see if the brake pedal is still soft.

M0nk3y · 06-01-2020, 03:03 PM

Quote:

Originally Posted by Code Monkey

New rotors and brake pads? Go and bed-in the brake pads first and see if the brake pedal is still soft.

This, and make sure you get into the ABS to cycle the pump and possibly free other air that may exist

Thefalls · 06-01-2020, 03:37 PM

I made this mistake in another car once, had air in the abs pump.
Its a mess, but you have to "cycle" the abs pump to get the air out.
In my case i had to bleed the brakes every time i engaged the abs pump on some wet stretch of back roads. Honestly i didn't know any other way to do it and on the third time my brakes were back to normal pedal stiffness.

Top Gun · 06-07-2020, 11:21 AM

I installed the CTSV brembos on the front. After bleeding and ran the resevoir dry, and bleeding again until I ran out of clean brake fluid. I called it a day and bedded in the brakes where I activated ABS each time. I bled the brakes on all 4 corners a few days later and all the air is gone. Pedal is stiffer than stock with the SS brake lines :')

05-31-2020, 05:05 PM	#1
Top Gun Member Join Date: Dec 2019 Drives: 2013 FRS, 2015 FRS Turbo Location: Florida Posts: 12 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s)	Bled the brake reservoir empty, what next? Installed a front BBK with stainless steel lines and I accidently let the reservoir go empty. We kept bleeding and bleeding and there were still some micro-bubbles. I eventually eventually ran out of brake fluid and started to re-use some of the brake fluid as it was clean. I had 3 32oz bottles. The pedal is stiff but not as stiff as it should be. Do I need to bench bleed the master cylinder? I was thinking of bleeding all 4 brakes with 1 gallon of brake fluid.

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05-31-2020, 07:30 PM	#2
Code Monkey Senior Member Join Date: Jul 2016 Drives: Subaru BRZ Location: Atlanta, GA Posts: 879 Thanks: 988 Thanked 597 Times in 355 Posts Mentioned: 4 Post(s)	New rotors and brake pads? Go and bed-in the brake pads first and see if the brake pedal is still soft.

06-01-2020, 03:37 PM	#4
Thefalls Senior Member Join Date: Feb 2014 Drives: Corolla GT Location: Sunny place. Posts: 208 Thanks: 372 Thanked 118 Times in 90 Posts Mentioned: 6 Post(s)	I made this mistake in another car once, had air in the abs pump. Its a mess, but you have to "cycle" the abs pump to get the air out. In my case i had to bleed the brakes every time i engaged the abs pump on some wet stretch of back roads. Honestly i didn't know any other way to do it and on the third time my brakes were back to normal pedal stiffness.

06-07-2020, 11:21 AM	#5
Top Gun Member Join Date: Dec 2019 Drives: 2013 FRS, 2015 FRS Turbo Location: Florida Posts: 12 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s)	I installed the CTSV brembos on the front. After bleeding and ran the resevoir dry, and bleeding again until I ran out of clean brake fluid. I called it a day and bedded in the brakes where I activated ABS each time. I bled the brakes on all 4 corners a few days later and all the air is gone. Pedal is stiffer than stock with the SS brake lines :')

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