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Bleeding Brakes

Started by blown308 , Aug 11 2009 07:26 PM

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20 replies to this topic

#1 blown308

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Posted 11 August 2009 - 07:26 PM

I have put all the new brake lines onto the FJ... I am now wondering how do I get the brake fluid through.. do we just keep pumping the brake pedal until it starts to come out.. Help :blink:

Wayne

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#2 dattoman

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Posted 11 August 2009 - 07:29 PM

Is the master still under the floor >?

FJ is a pig to bleed cause the fluid has to go in odd places to get to the wheels

Have you adjusted everything first ?

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#3 _nial8r_

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Posted 11 August 2009 - 07:35 PM

there is a few different ways this can be sorted,

try strating the car and pumping the pedel

try using brake bleeder bottles so you can open all the bleeder nipples at the same time and then start pumping the pedel

try pushing some brake fluid with a syringe into the brake line from either end then conect em back up and start the pumping again ( warning: this is the messy way but has been known to work )

hope this might help :spoton:

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#4 dattoman

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Posted 11 August 2009 - 07:38 PM

Overstroking a single line master cylinder will cause it to cut the primary cup and start leaking out the back
So no mad pumping
And starting the car will have no effect on a FJ master as its unboosted

Unless the cars been modified and has a non original master and or remote booster fitted

More details required please

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#5 _Squarepants_

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Posted 11 August 2009 - 08:34 PM

Would a vacuum bleeder work?
Connect it to the bleeder, plug in the air line, crack the nipple, watch and wait???
Don't know the system on an FJ but from what I've seen of these vacuum jobs, they're magic.

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#6 blown308

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Posted 11 August 2009 - 08:47 PM

car not running yet, and no datto it has a VN Brake Booster.......

front brake are Hoppers twin piston and rears are VK discs...

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#7 Struggler

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Posted 11 August 2009 - 09:55 PM

I am a big fan of the vacuum bleeder, particularly when everything is new.

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#8 _SS Hatchback_

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Posted 11 August 2009 - 09:55 PM

those vacuum bleeders are excellent , put it on the end , crack the nipple and let it suck the fluid through.

Anyway i bled the master first on its own, then installed it . Then did each line starting from the furthest caliper first (ie rear left) . Using the normal push pedal and crack nipple and then close nipple before pedal hitting the floor. repeat repeat repeat . My misses reckons her leg was sore but i didnt feel a thing

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#9 blown308

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Posted 11 August 2009 - 10:03 PM

vacuum bleeder

Where Can I buy one of these....

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#10 Litre8

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Posted 11 August 2009 - 10:17 PM

The Earls Ezi-bleed brake nipples make this an easier process, just back the off a few turns and a spring keeps the exit sealed until pressure is applied. Makes it a one person brake bleed.

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#11 rodomo

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Posted 11 August 2009 - 10:29 PM

car not running yet, and no datto it has a VN Brake Booster.......

front brake are Hoppers twin piston and rears are VK discs...

All new stuff? :huh:

You might have to bleed the master cyl.

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#12 dattoman

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Posted 12 August 2009 - 12:12 AM

So VN master too ?
Under floor or in engine bay ?
You'll never get a perfect pedal first up anyway cause the pads have a certain amount of compression and need to bed in

But I think theres more to the story

Pics of everything ?

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#13 blown308

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Posted 12 August 2009 - 06:11 AM

best pictures I have off booster and master, front brakes, do not have pictures of 10 Bolt diff and brakes sorry

Posted Image

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#14 ls2lxhatch

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Posted 12 August 2009 - 10:48 AM

Start with bench bleeding the master cylinder.

http://static.summit...9-1-2-3-4-5.pdf

http://static.summit...ng_addendum.pdf

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#15 dattoman

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Posted 12 August 2009 - 07:28 PM

Make sure there is clearance and the master isn't proloaded and holding the piston down
The master if second hand could be rooted
You could try reverse bleeding
Shame its got those aweful braided hoses on it
You could be clamping lines and finding the actual problem area

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#16 blown308

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Posted 12 August 2009 - 08:53 PM

Shame its got those aweful braided hoses on it

Neil, threw them away, Matt at Race Brakes got me some new plain black ones made.. I have put all new lines and hoses alround, booster was rebuilt some time ago though, maybe its stuffed.. Wayne

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#17 blown308

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Posted 12 August 2009 - 11:06 PM

another question - Do I need a proportioning valve ???

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#18 dattoman

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Posted 12 August 2009 - 11:08 PM

You have one built into the master cylinder already

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#19 blown308

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Posted 13 August 2009 - 06:47 AM

You have one built into the master cylinder already

thanks that is what i thought....

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#20 blown308

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Posted 16 August 2009 - 05:36 PM

well I have brakes sort off, but the pedal is real soft... and only get brakes about 2 inchs from the floor, and ideas on what my problem is

rgds
wayne