Damn 60 series brakes....interesting problem

[Zako]

Hey Guys,

I know, another brake thread, however I've searched and haven't found something like this talked about:

Background:

Tank has a new master cylinder, new front brake pads and rotors, new rear shoes, new wheel cylinders, machined drums. I did all of this for some peace of mind.

Problem:

It's kind of interesting driving tank, as the pedal needs to be pumped 4-5 times, and then she grabs like crazy and has locked up on me a few times making for some rather interesting driving.

I've adjusted the rear brakes, bled the brake system god knows how many times (yes there's fluid in the brake fluid reservoir). The pedal just goes through to the floor.

Is there something I'm missing? Something needs changing? I've inspected the flexible brake lines and there's no evident leaks.

Can someone please shed some light on this?


Kind Regards,


Zako

 

[OlympiaFJ60]

Did it behave like this before all the work or were you just doing some preventative maintenance? Have you tried another master? Maybe you just got a bad one.

 

[Zako]

It was doing it prior to the overhaul. But now it seems to be getting worse.

I haven't tried another master. I just assumed the brand new one was good. I have another one from a HJ60 sitting at home...maybe give that one a go?

 

[mkaustin]

Did you bench bleed the Master Cyl before you put in on??
I only ask 'cause I did this once. I thought that I could bleed it out, but the pedal kept going to the floor.

 

[Zako]

Nah I didn't do that. Didn't realise I should've done that.

I've also found that my rear brakes arent properly adjusted....but I didn't think that this would make such a big difference in the pedal feel?

 

[sandcruiser]

could also be the adjusting rod that connects the master to the booster. if that is too long or short it means that the master isn't really doing it's job

 

[brett76]

i havent done the brakes on my sixty yet. they get a pattern bleed right? did you do this? and what is it for future reference?

 

[OlympiaFJ60]

Start the furthest away from the master (right rear?) and work your way closer, left rear, right front, left front.

 

[Cruzerman]

While rear brakes often aren't properly adjusted due to dirt & corrosion, they are suppose to be self-adjusting via the e-brake. Since you just rebuilt the rear, they should self-adjust. If they aren't, I'd revisit them to find out why.

However, I'm not sure this is your issue. Your symptoms sure sound like air in the system. I would "fix" the rear brakes, bleed it again (including the master) and see where I stand.

 

[OlympiaFJ60]

They are self adjusting as long as you use your parking brake. If you aren't very close when installing the rear brakes, it can take a while to adjust too. Best to adjust by hand at the wheel cylinder.

 

[2mbb]

i havent done the brakes on my sixty yet. they get a pattern bleed right? did you do this? and what is it for future reference?

FSM says to start with the wheel cylinder that has longest hydraulic line and work your way to smallest. For the US vehicles this is drivers side rear, passenger side rear, drivers side front, passenger side front. If you have an LSPV (?) then than is done last.

However, since the front and rear axles are completely different hydraulic circuits back to the master cylinder, I'm not sure whether it makes a difference to do the rear's first then the fronts...however, since you can only do one at a time...