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92 fj rotor bolts

Started by Tapartacus, May 28, 2012, 04:41:32 AM

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Tapartacus

#15
June 05, 2012, 11:10:24 PM
So get this! Brought my 92 in to replace rotors and great news! they found a nail in my rear tire, another $260 bucks. Also they said that after replacing the rotors the brakes still rub excessively. They said the callipers are not retracting. I told them that I rebuilt them already! they asked what I lubed the pistons with, I said uh... brake fluid? he said I should have greased them, is this correct? My manual says nothing about grease. Any thoughts?. They want to rebuild them again, all my hard work and also my pride at all my hard work down the drain.
Andrew
92  FJ1200
89  FJ1200

Harvy

#16
June 06, 2012, 01:26:35 AM
Quote from: Tapartacus on June 05, 2012, 11:10:24 PM
So get this! Brought my 92 in to replace rotors and great news! they found a nail in my rear tire, another $260 bucks. Also they said that after replacing the rotors the brakes still rub excessively. They said the callipers are not retracting. I told them that I rebuilt them already! they asked what I lubed the pistons with, I said uh... brake fluid? he said I should have greased them, is this correct? My manual says nothing about grease. Any thoughts?. They want to rebuild them again, all my hard work and also my pride at all my hard work down the drain.
Andrew

Rubber grease is used on external rubber parts only.... I would not use it on the piston seals. Brake fluid is all that is required.

Harvy
FJZ1 1200 - It'll do me just fine.
Timing has much to do with the success of a rain dance.

fj11.5

#17
June 06, 2012, 03:29:29 AM
I've used pbr brake seal grease with no issues , compatible with all . brake fluids
unless you ride bikes, I mean really ride bikes, then you just won't get it

84 Fj1100  effie , with mods
( 88 ) Fj 1200  fairly standard , + blue spots
84 Fj1100 absolutely stock standard, now more stock , fitted with Fj12 twin system , no rusted headers for this felicity jayne

fj1289

#18
June 08, 2012, 05:03:57 AM
I thought PBR was for internal lubrication only?!      :lol:

fj11.5

#19
June 08, 2012, 05:44:03 AM
not if thats one of those watered down UsOf a beers, that would boil off pretty quickly  :lol:
unless you ride bikes, I mean really ride bikes, then you just won't get it

84 Fj1100  effie , with mods
( 88 ) Fj 1200  fairly standard , + blue spots
84 Fj1100 absolutely stock standard, now more stock , fitted with Fj12 twin system , no rusted headers for this felicity jayne

WestOzXJR

#20
June 08, 2012, 09:22:43 AM
Quote from: Harvy on June 06, 2012, 01:26:35 AM
Rubber grease is used on external rubber parts only.... I would not use it on the piston seals. Brake fluid is all that is required.

If you've ever had the pleasure to pull something apart that's been assembled with that red sh*t f**ken rubber grease (say inside a hydraulic ram for example) and seen what becomes of that CRAP... It goes as hard as a rock and gets in behind the seals and interferes with how the seal is supposed to flex and conform to do it's job properly... Every earth-moving equipment workshop I go in to manage I throw every tub of that SH*T out I can find.

If the piston and the bore are perfectly clean and not pitted then brake fluid should work fine and nothing else should be used to contaminate what is a highly specialized fluid.

Another thing to suggest is to ensure that where on the calliper housing that is contacted by the edge of the metal backing plate of the pads, and the pins, should be smooth so the pads are completely free to slide and retract to where they need to be and are not going to "hook up" on/be influenced by notches or build-up of brake dust or other crud. I use a small hand wire brush to get into where the pads slide to prep the housing and fine emery cloth to clean the pins and the times I've been too lazy to do it I end up regretting it and then pull apart to do it properly as I can feel the difference in either too much pedal/lever free travel or a slightly binding pad.
Nitrous is nice but I'd rather be blown.

We don't see things as they are, we see them as we are. -Anais Nin

fj11.5

#21
June 08, 2012, 06:27:47 PM
don't know what red lube you don't like , but the pbr stuff is made for brakes , its very thin , almost watery grease made to use with brake systems , ill take a pic of the tube ,
unless you ride bikes, I mean really ride bikes, then you just won't get it

84 Fj1100  effie , with mods
( 88 ) Fj 1200  fairly standard , + blue spots
84 Fj1100 absolutely stock standard, now more stock , fitted with Fj12 twin system , no rusted headers for this felicity jayne

Sideburns

#22
June 16, 2012, 04:07:31 AM
I always grease the pistons.
And I always use grease made specially for the job. I use Grease from ATE. They make brakes.

Brake fluid is not a lubricant.

When the bolt has been damaged and you're not going to use it when reinstalling the rotor, I simply weld a nut onto the bolt-head
The heat from the welding helps. Some skill needed.

SlowOldGuy

#23
June 16, 2012, 02:37:15 PM
If you had the pistons fully retracted and pumped them out to squeeze the pads and rotor, they will initially drag.

What you need to do is push the pistons back in about 3mm and try it again.  The pads are retracted by flexure of the seals.  When you pump a fully retractred piston out, the seals will "stick" and not retract the piston.  Resetting the piston slightly will push the seal back so it can now flex and pull the piston off the pad.

You might have to try it a few times to get the seal in the proper orientation.

DavidR.
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