Toyota Rear disc brakes issue

Hotwheels · 02-20-2011, 08:32 PM

So I just put 4340 axles and rear disc brakes on my 94 4runner. I had to put a new booster on it and rebuild the front calipers. The problem I am having is the brake pedal feels like **** after I have blead the brakes. I dont have any leaks in the system. The rear brakes are sky-manufacturing rear disc set up with Chevy calipers and stainless lines running on the rear axle. I have a porportioning valve and 10lb residual valve comming off the master for the rear brakes. The only thing I can think of is I have a air pocket some where in the system and it has just not bleed out yet. Any thought or comments would be great.

Rob

humpy · 02-20-2011, 08:38 PM

to my knowledge a stock brake master cyl is big enough for the rear disk setup..i.e. it makes for a spongey pedal...we usually put a master cyl off a 93 yota t100 non abs on em and it works great...hope it helps...maybe someone else can help more??

fabricator · 02-20-2011, 10:45 PM

sounds like air
that have a 1" bore master on it?
always bleed farthest corner to the nearest to the master.
bleed porportioning valve last. if it had one
sounds like u dont have anymore
fyi...these trucks r the hardest units i have ever had to bleed

Hotwheels · 02-20-2011, 11:06 PM

yes has 1" master on it

itbrokeagain · 02-20-2011, 11:07 PM

Try a pressure bleeder if you can get access

Hotwheels · 02-21-2011, 08:59 AM

I have power bleed the brakes on my 4runner. The only thing I can think of at this time is I am using my stock ABS master cylinder and the rear part of the master is to weak and I need to change it to a non ABS master.

Hotwheels · 02-21-2011, 07:11 PM

So here is what I did today with the brakes. I have a 1" bore non ABS master cylinder on my 4runner. I have no proportioning valve and no 10lb residual valve on it at all. Took it all of to make sure it was not them. The runner had rear ABS and it is not hooked up at all. I have speed bleed the brakes and 2 person bleed the brakes and still have a ****ty pedal with the truck off and it goes to the floor when it is running. I am so fing pissed at this thng. I have also call sky and talk to someone there and he told me that everything I have done they would have done. So I am sunk any help would be great.

Rob

02-20-2011, 08:32 PM	#1
Hotwheels Join Date: Aug 2010 Location: Maineville, Ohio Posts: 125	Toyota Rear disc brakes issue So I just put 4340 axles and rear disc brakes on my 94 4runner. I had to put a new booster on it and rebuild the front calipers. The problem I am having is the brake pedal feels like **** after I have blead the brakes. I dont have any leaks in the system. The rear brakes are sky-manufacturing rear disc set up with Chevy calipers and stainless lines running on the rear axle. I have a porportioning valve and 10lb residual valve comming off the master for the rear brakes. The only thing I can think of is I have a air pocket some where in the system and it has just not bleed out yet. Any thought or comments would be great. Rob

02-20-2011, 08:38 PM	#2
humpy Join Date: Sep 2008 Posts: 573	to my knowledge a stock brake master cyl is big enough for the rear disk setup..i.e. it makes for a spongey pedal...we usually put a master cyl off a 93 yota t100 non abs on em and it works great...hope it helps...maybe someone else can help more?? __________________ S10 with a few air shocks..

02-20-2011, 10:45 PM	#3
fabricator Join Date: Jan 2007 Location: Cincy, Oh Posts: 947	sounds like air that have a 1" bore master on it? always bleed farthest corner to the nearest to the master. bleed porportioning valve last. if it had one sounds like u dont have anymore fyi...these trucks r the hardest units i have ever had to bleed __________________ For you guys who can't drive, I have owned a frame rack for several years. Prices are based on your skill and ability to wreck it.... Last edited by fabricator; 02-20-2011 at 10:51 PM.

02-20-2011, 11:07 PM	#5
itbrokeagain Just Empty Every Pocket - CORE Member - Join Date: Feb 2007 Location: Amelia Posts: 1,435	Try a pressure bleeder if you can get access __________________ 91 fj 80 on 37 Nitto Muds with a 10k winch. Cage and sliders coming soon.

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02-20-2011, 11:06 PM	#4
Hotwheels Join Date: Aug 2010 Location: Maineville, Ohio Posts: 125	yes has 1" master on it

02-21-2011, 08:59 AM	#6
Hotwheels Join Date: Aug 2010 Location: Maineville, Ohio Posts: 125	I have power bleed the brakes on my 4runner. The only thing I can think of at this time is I am using my stock ABS master cylinder and the rear part of the master is to weak and I need to change it to a non ABS master.

02-21-2011, 07:11 PM	#7
Hotwheels Join Date: Aug 2010 Location: Maineville, Ohio Posts: 125	So here is what I did today with the brakes. I have a 1" bore non ABS master cylinder on my 4runner. I have no proportioning valve and no 10lb residual valve on it at all. Took it all of to make sure it was not them. The runner had rear ABS and it is not hooked up at all. I have speed bleed the brakes and 2 person bleed the brakes and still have a ****ty pedal with the truck off and it goes to the floor when it is running. I am so fing pissed at this thng. I have also call sky and talk to someone there and he told me that everything I have done they would have done. So I am sunk any help would be great. Rob