spongy brakes HELP

Forum for Infiniti M35 and M45, and Nissan Fuga owners.
SeveLampley
Posts: 34
Joined: Tue Feb 18, 2020 8:04 am
Car: 2007 Infiniti M35-k23 silver, 5 stage paint correction, 2 ceramic coats, full bolt on, uprev tuned, d&s rotors, hawks hs1 pads, dot 5.1 steel lines

spongy brakes HELP

Postby SeveLampley » Wed Dec 30, 2020 5:00 pm

Couple days ago i put new brake lines on and while I was beeding it,i think i let the resouvioir run dry. now I think the master cylinder has air in it. so my question is, does it just need bench-bled or does it need rebuit/ replaced


User avatar
VStar650CL
Posts: 2022
Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

Re: spongy brakes HELP

Postby VStar650CL » Wed Dec 30, 2020 5:54 pm

Masters will generally bleed out okay by cracking the fittings at the master, but since the system will now have air from the top down, it would be a good idea to crack the intermediate fittings at the ABS as well, then bleed the wheels again. In case you don't know, never push the pedal all the way to the floor when bleeding -- there's often a circle of crud that builds up inside the master at the spots where the seals normally stop moving, and it can cause a ring of corrosion and pitting in the bore. If you push the pedal past it while bleeding, the pits can tear the seals and ruin the master. Generally you want to stroke the pedal about 1/2~5/8 of the way to the floor and don't push past that.

User avatar
Ilya
Moderator
Posts: 9421
Joined: Fri Apr 23, 2010 11:20 pm
Car: 2011 M56x but I spend a lot of time on my 2015 Kawasaki Vulcan S. Former owner of a 2007 M35x. Also take care of my wife's 2016 QX60.
Location: Tampa, FL
Contact:

Re: spongy brakes HELP

Postby Ilya » Wed Dec 30, 2020 10:09 pm

VStar650CL wrote:
Wed Dec 30, 2020 5:54 pm
Masters will generally bleed out okay by cracking the fittings at the master, but since the system will now have air from the top down, it would be a good idea to crack the intermediate fittings at the ABS as well, then bleed the wheels again. In case you don't know, never push the pedal all the way to the floor when bleeding -- there's often a circle of crud that builds up inside the master at the spots where the seals normally stop moving, and it can cause a ring of corrosion and pitting in the bore. If you push the pedal past it while bleeding, the pits can tear the seals and ruin the master. Generally you want to stroke the pedal about 1/2~5/8 of the way to the floor and don't push past that.
Didn't know that about the pedal. My dad and me bleed my brakes together across like 6 cars and never in 20 years had an issue. But, what you're saying makes sense. Very interesting.

SeveLampley
Posts: 34
Joined: Tue Feb 18, 2020 8:04 am
Car: 2007 Infiniti M35-k23 silver, 5 stage paint correction, 2 ceramic coats, full bolt on, uprev tuned, d&s rotors, hawks hs1 pads, dot 5.1 steel lines

Re: spongy brakes HELP

Postby SeveLampley » Wed Dec 30, 2020 10:41 pm

VStar650CL wrote:
Wed Dec 30, 2020 5:54 pm
Masters will generally bleed out okay by cracking the fittings at the master, but since the system will now have air from the top down, it would be a good idea to crack the intermediate fittings at the ABS as well, then bleed the wheels again. In case you don't know, never push the pedal all the way to the floor when bleeding -- there's often a circle of crud that builds up inside the master at the spots where the seals normally stop moving, and it can cause a ring of corrosion and pitting in the bore. If you push the pedal past it while bleeding, the pits can tear the seals and ruin the master. Generally you want to stroke the pedal about 1/2~5/8 of the way to the floor and don't push past that.
Where are the abs fittings and how would I bleed those?

User avatar
VStar650CL
Posts: 2022
Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

Re: spongy brakes HELP

Postby VStar650CL » Thu Dec 31, 2020 5:07 am

You should have 4 individual lines running from the ABS to the wheels, crack them at the ABS end. Once all the air is out topside, then re-bleed the wheels.

SeveLampley
Posts: 34
Joined: Tue Feb 18, 2020 8:04 am
Car: 2007 Infiniti M35-k23 silver, 5 stage paint correction, 2 ceramic coats, full bolt on, uprev tuned, d&s rotors, hawks hs1 pads, dot 5.1 steel lines

Re: spongy brakes HELP

Postby SeveLampley » Thu Dec 31, 2020 10:30 am

VStar650CL wrote:
Thu Dec 31, 2020 5:07 am
You should have 4 individual lines running from the ABS to the wheels, crack them at the ABS end. Once all the air is out topside, then re-bleed the wheels.
so do i bleed the abs before i bleed the wheels or vice-versa?

User avatar
VStar650CL
Posts: 2022
Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

Re: spongy brakes HELP

Postby VStar650CL » Thu Dec 31, 2020 11:43 am

The air from the reservoir entered top-down, so the system needs to be bled the same way. Master first, ABS second, wheels last.

SeveLampley
Posts: 34
Joined: Tue Feb 18, 2020 8:04 am
Car: 2007 Infiniti M35-k23 silver, 5 stage paint correction, 2 ceramic coats, full bolt on, uprev tuned, d&s rotors, hawks hs1 pads, dot 5.1 steel lines

Re: spongy brakes HELP

Postby SeveLampley » Thu Dec 31, 2020 5:25 pm

VStar650CL wrote:
Thu Dec 31, 2020 11:43 am
The air from the reservoir entered top-down, so the system needs to be bled the same way. Master first, ABS second, wheels last.
Can’t find anything in the exact procedure. Do I just crack each line open individual and have someone hit the brakes?

User avatar
VStar650CL
Posts: 2022
Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

Re: spongy brakes HELP

Postby VStar650CL » Thu Dec 31, 2020 5:41 pm

Just like bleeding the wheels, one at a time with an assistant.


Return to “Infiniti M35 and M45 Forum”