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Trent Linnell
TryHard
Victoria
V8

Posts: 303
Reg: 10-2007

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Tuesday, August 17, 2010 - 09:31 pm, by:  Trent Linnell (Tlinnell) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I have a V8 and recently replaced my front rotors and calipers from a Supra. Driving the car afterward, everything was fine. Just took the car to get new Power Steering Rack Bushes and when I come to stop at the traffic lights, between 15-10kms the brake pedal will kick up (as though the abs was kicking in) and then the pedal will depress as normal and come to a stop.

I removed the front wheels to see if there was an brake fluid leaks but everything was fine there. I then removed the ABS fuses to see if there was any change and the problem went away. I then put the fuse back in and did a diagnostic check (but couldn't understand the flashing sequence) and this came up on the dash.

Does anyone know what the problem could be??
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Darren Bauer
Tinkerer
Victoria
Soarer TT

Posts: 96
Reg: 04-2010

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Tuesday, August 17, 2010 - 10:24 pm, by:  Darren Bauer (Dazmon) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

It says Daiagu modo, you must still be in diagnostics mode?
Trent Linnell
TryHard
Victoria
V8

Posts: 305
Reg: 10-2007

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Tuesday, August 17, 2010 - 11:02 pm, by:  Trent Linnell (Tlinnell) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

All good found out what I need to do. Thanks for your help.

http://soarercentral.com/sc-forum/messages/282/282550.html
Matthew Sharpe
Goo Roo
North Island
JZZ31

Posts: 5761
Reg: 10-2005

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Wednesday, August 18, 2010 - 06:58 am, by:  Matthew Sharpe (Madmatt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Darren Bauer wrote on Tuesday, August 17, 2010 - 10:24 pm:

It says Daiagu modo,




Really? Daiagu Modo is Japanese for Diagnostic Mode? Bizare.
Darren Bauer
Tinkerer
Victoria
Soarer TT

Posts: 97
Reg: 04-2010

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Wednesday, August 18, 2010 - 04:18 pm, by:  Darren Bauer (Dazmon) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I was translating it literally, I had no idea about the other thread, if that's what you're getting at?
Trent Linnell
TryHard
Victoria
V8

Posts: 306
Reg: 10-2007

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Wednesday, August 18, 2010 - 04:25 pm, by:  Trent Linnell (Tlinnell) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Yeah that's what I meant.....

Anyways I did the diagnostic again and no error came up for ABS.....

Anyone with any ideas??
Nathan Richardson
TryHard
N.T.
UZZ32 #445 (V8 Supercherged 5Speed. 291RWKW)

Posts: 244
Reg: 02-2006

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Wednesday, August 18, 2010 - 08:41 pm, by:  Nathan Richardson (Richtheblack) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I don't want to really take a stab in the dark here because my comment my be factually floored, but I believe there has been issues in the past with the ABS, particularly with Soarers with smaller calipers, that there is too much travel on the brake pedal.

This should result with a soft feel also. I have heard braided brake lines may resolve this.

Cheers,

Nath.
Trent Linnell
TryHard
Victoria
V8

Posts: 308
Reg: 10-2007

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Wednesday, August 18, 2010 - 08:57 pm, by:  Trent Linnell (Tlinnell) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Thanks for your comment Nathan but this doesn't help me with my current problem.

There is nothing wrong with the Stiffness of the Pedal.
Nathan Richardson
TryHard
N.T.
UZZ32 #445 (V8 Supercherged 5Speed. 291RWKW)

Posts: 249
Reg: 02-2006

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Wednesday, August 18, 2010 - 09:57 pm, by:  Nathan Richardson (Richtheblack) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

You welcome Trent, but it still might have something to do with it.

I can't help but think, your brakes (ABS) were fine, you upgraded the brakes, this problem appears.

I have had that same warning due to accumulator pressure, however the symptoms are not the same.

Cheers.
Trent Linnell
TryHard
Victoria
V8

Posts: 309
Reg: 10-2007

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Wednesday, August 18, 2010 - 10:07 pm, by:  Trent Linnell (Tlinnell) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

the brakes were fine for 2 weeks.....

anyways I might have to take it somewhere to get it checked.
Nathan Richardson
TryHard
N.T.
UZZ32 #445 (V8 Supercherged 5Speed. 291RWKW)

Posts: 250
Reg: 02-2006

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Wednesday, August 18, 2010 - 10:13 pm, by:  Nathan Richardson (Richtheblack) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Trent Linnell wrote on Wednesday, August 18, 2010 - 10:07 pm:

the brakes were fine for 2 weeks.....




I see. Hmmmm, that changes things.

Sorry I haven't been any help with my thoughts. Hopefully someone here has had a similar experience to help you out.

Cheers,

Nath.
Matt Petersen
DieHard
NA
V8

Posts: 778
Reg: 01-2008

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Thursday, August 19, 2010 - 02:41 pm, by:  Matt Petersen (Mattmannz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I upgraded my fronts to Supra TT setup and had an issue with my left hand side caliper.

It was if ABS was kicking in on just the one caliper.

Pulled everything apart and cleaned the ABS wheel speed sensor and everything was fine. I never had any error messages though.

Perhaps you have damaged a wheel speed sensor when you did the swap.

The diagnostics should tell you what is wrong though.

The larger Supra calipers can result in a slightly longer pedal travel on a Soarer.

Matt.
Andrew La'Brooy
TryHard
Victoria
UZA80 Supra (1UZ Swap)

Posts: 112
Reg: 06-2007

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Thursday, August 19, 2010 - 04:05 pm, by:  Andrew La'Brooy (Andyttr) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

You shouldn't get longer pedal travel with the Supra callipers as the piston volume is the same as the original V8 brakes. The Supra 2-pot callipers are also identical to the Soarer TT callipers. Both early JZA80's, V8 and TT Soarers use the same master cylinder. If you do get longer pedal travel then something else is wrong in your system.

Trent, you'll have to come show me what it is doing because I don't understand the description. lol Does the car pull to one side when this is happening?

The only way the pedal can come back up is if pressure from the ABS pump is going backwards through the modulator to the master cylinder. It shouldn't do this. When you get an ABS intervention the pedal feel should go 'hard' and then down when the modulator stops building pressure.

My money is on bung seals in the ABS modulator or MC.

As a side note, its pretty common for MC seals to go after the system is bled for the first time in a long time. Crap builds up at the end of the piston stroke, then when you bleed the system you drag the seals through the accumulated crap...
Matt Petersen
DieHard
NA
V8

Posts: 782
Reg: 01-2008

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Thursday, August 19, 2010 - 04:16 pm, by:  Matt Petersen (Mattmannz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

The early model JZA80's had the same brakes as the TT's but the laters had the four pot calipers and a larger master cylinder.

Not sure if anyone would swap the early 2 pots over, everyone I have heard swaps the 4 pots on which is what I did and got a slightly longer pedal travel.

During an ABS event it can seem like the pedal is coming up but as you say the pedal will go hard then soft then hard as the ABS pulses on and off.

Matt.
Andrew La'Brooy
TryHard
Victoria
UZA80 Supra (1UZ Swap)

Posts: 113
Reg: 06-2007

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Thursday, August 19, 2010 - 04:29 pm, by:  Andrew La'Brooy (Andyttr) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Even the JZA80's with the 4/2 setup use an MC with the same bore, but the front to rear proportioning is different IIRC - hence the slightly longer pedal throw.

Its fairly common for UZZ30/31 owners to upgrade to the JZZ30 / JZA80 2/1 piston setup. The stock V8 brakes use the same pads as an old Camry or Celica... scary stuff for a car that weighs ~200kg more. :p

The TT brakes are a good upgrade as they have slightly larger rotors and bigger pads than the stock V8 ones. The rear callipers are identical, just the rotors and anchor brackets are larger to suit.

Trent, if the pedal is not actually coming up when you're braking there's a chance you're just having over-sensitive ABS issues caused by the different tyre sizes on your front axle compared to your rears. Come grab the rear 16's and see if it fixes the problem?}
Matt Petersen
DieHard
NA
V8

Posts: 783
Reg: 01-2008

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Thursday, August 19, 2010 - 05:12 pm, by:  Matt Petersen (Mattmannz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Thanks Andrew, just did some research and that's right, same master cylinder all the way through.

The V8 brakes are horrid! The 4 pots are awesome!

Matt.
Trent Linnell
TryHard
Victoria
V8

Posts: 313
Reg: 10-2007

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Monday, August 23, 2010 - 10:00 pm, by:  Trent Linnell (Tlinnell) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Well got around to cleaning out the sensor tonight, the left one was caked in white cheese!!!! So cleaned it and put it back in.

Problem Fixed!!!! Thanks again for your help Matt!!!

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