Possible air in ABS

BettyZ · 04-24-2019, 05:20 PM

Flushed brake fluid last week, disconnected ABS module's wire harness beforehand. Used motive powerbleeder, no issues. Started car up without connecting ABS harness (oops). Realized the issue before I went anywhere, shut off engine, reconnected harness. Now brakes feel much softer than before.

Is this symptomatic of air in the ABS module and if so, is there a way to deal with it without using a code reader to make the ABS pump the air out or whatever trickery?

Much appreciated in advance.

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Rusty · 04-25-2019, 09:37 PM

Leave the abs connected, key off. Bleed the brakes the old fashion way. With 2 people. Pump 3 times and hold, release bleeder screw. Repeat.

BettyZ · 04-25-2019, 10:55 PM

Quote:

Originally Posted by Rusty

Leave the abs connected, key off. Bleed the brakes the old fashion way. With 2 people. Pump 3 times and hold, release bleeder screw. Repeat.

Thank you!

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nis350 · 05-01-2019, 12:48 AM

what is the reason for disconnecting the abs for the flush?

Quote:

Originally Posted by BettyZ

Flushed brake fluid last week, disconnected ABS module's wire harness beforehand. Used motive powerbleeder, no issues. Started car up without connecting ABS harness (oops). Realized the issue before I went anywhere, shut off engine, reconnected harness. Now brakes feel much softer than before.

Is this symptomatic of air in the ABS module and if so, is there a way to deal with it without using a code reader to make the ABS pump the air out or whatever trickery?

Much appreciated in advance.

Sent from my SM-G955U using Tapatalk

ZontheRocks · 05-01-2019, 05:49 AM

Quote:

Originally Posted by nis350

what is the reason for disconnecting the abs for the flush?

Some of the write ups for general brake fluid flush with an ABS system include disconnecting the ABS system. Can be confusing info.

I’m with Rusty on this one.

BettyZ · 05-01-2019, 07:33 AM

Quote:

Originally Posted by ZontheRocks

Some of the write ups for general brake fluid flush with an ABS system include disconnecting the ABS system. Can be confusing info.

I’m with Rusty on this one.

^^ what Z said.

I disconnected ABS last time I flushed and had no issues, as well. Think the problem this time was forgetting to reconnect it before I started her up.

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BettyZ · 05-01-2019, 09:26 AM

Also, oddly enough, apparently when your ABS is disconnected, pressing the start button will not shut off the car.

Rusty · 05-01-2019, 11:04 PM

Quote:

Originally Posted by BettyZ

^^ what Z said.

I disconnected ABS last time I flushed and had no issues, as well. Think the problem this time was forgetting to reconnect it before I started her up.

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I flush my brake system with the ABS connected. I start with the LR outer, LR inner. RR outer, RR inner, LF outer, LF inner, RF outer, RF inner. I do it the old fashion way with 2 people. And NEVER let the brake reservoir get to 1/4 full.

04-24-2019, 05:20 PM	#1 (permalink)
BettyZ A True Z Fanatic Join Date: Aug 2018 Location: Chicagoland Age: 37 Posts: 5,261 Drives: A Garage Queen Rep Power: 2684370	Possible air in ABS Flushed brake fluid last week, disconnected ABS module's wire harness beforehand. Used motive powerbleeder, no issues. Started car up without connecting ABS harness (oops). Realized the issue before I went anywhere, shut off engine, reconnected harness. Now brakes feel much softer than before. Is this symptomatic of air in the ABS module and if so, is there a way to deal with it without using a code reader to make the ABS pump the air out or whatever trickery? Much appreciated in advance. Sent from my SM-G955U using Tapatalk __________________ '14 MB Nismo \| Boost Lab 6870 1.32 AR 553 HP / 471 ft.-lbs. Betty Mods

04-25-2019, 09:37 PM	#2 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 34,887 Drives: 2011 Nismo GM 6M Rep Power: 2684436	Leave the abs connected, key off. Bleed the brakes the old fashion way. With 2 people. Pump 3 times and hold, release bleeder screw. Repeat. BGTV8, osbornsm, ZontheRocks and 1 others like this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

05-01-2019, 09:26 AM	#7 (permalink)
BettyZ A True Z Fanatic Join Date: Aug 2018 Location: Chicagoland Age: 37 Posts: 5,261 Drives: A Garage Queen Rep Power: 2684370	Also, oddly enough, apparently when your ABS is disconnected, pressing the start button will not shut off the car. __________________ '14 MB Nismo \| Boost Lab 6870 1.32 AR 553 HP / 471 ft.-lbs. Betty Mods