Hi Dan
My first time looking at this thread and I've gone all shakey...
Is it that I'm about to kick the bucket and follow all my workmates? (I've yet another workmate's funeral to go to this morning.)
More likely it's all the ogling I've just done of this lovely FJ45 that has fallen into your lap and that's in such incredible condition... <pic of face green with eny>
Anyway...
After yesterday's frozen wheel cylinder episode I began pulling them all down for inspection. All four rears are toast. I only had time to pull one corner from the front end but the bores were clean. The pistons were a bit blackened but I'm considering running them anyway as I think they're the factory installed cylinders. Thought's on this? What's interesting is that the rear cylinders [which I'm sure were aftermarket] weren't partitioned like the fronts. The rears could be pulled apart and looked straight through, but the fronts have a partition cast into them, effectively making one end move under braking pressure and the other purely for adjustment. Is this normal? Wondering if the difference is due to front vs. rear or stock vs. aftermarket.
This is from a 1965 parts catalogue and that "front-rear setup" seems to be standard for the era:
Gosh your front brakes look in good nick for a 1969!
The flex lines are a little gone. I think they'd still be ok as the inner line is still intact, but I'll replace them, especially after I discovered a rear hard line rusted through!...
Good heavens... And I should think SO!
You MUST certainly replace all flex lines that are that old simply based on their age if nothing else...
Sounds like fixing up your rear cylinders/pistons would be quite a mission.
I'm toying with getting someone over here to sleeve an old brake master with stainless so perhaps that's an option for you on your wheel cylinders.. (Trouble is ... I don't trust many other people's workmanship so I'd prefer to find a kit that allows me to sleeve my master myself....)
I think you need to look at all your options ... just like I plan on doing. (The brake fluid in my master has gone really black which shows me that it is full of "rubber seal-wear particles" and will soon be giving me trouble. As I recall the bore had a little gouge in it when I last rekitted it.)
If you find quality new cylinders that are made very much the same as the originals and that don't cost you an arm and a leg then that might be the way to go.
I'm still running all original wheel cylinders and some time back I put in new cups all round without honing either. And they're all leak-free and working well (unlike the wifes car at the moment which is showing 15% braking variation between left and right at the front but then off course those are discs up there) .
I reckon a key to getting wheel cylinders to last and to be trouble free is to have good boots and ensure that there's always wet (not dried) rubber-grease under those boots to keep all the pistons sliding freely.
But you of course need your cylinder bores to be unpitted and without ridges (and ideally looking silky smooth as you say).. ................(unlike the bore of my master with its little gouge)
