I know everthing there is to know about dot5 know, especially after adding dot3 to top off the master cylider...I can't belive that I did that It appears fine at first till the brakes have warmed, then they all lock up. Turns out mixing the two causes the fluid to jell.

Help! I know I need to completly flush the system before returning to dot4 this time, but not sure what else might be involved, like replacing the rubber components and such.

Well, I haven't run into the Jello aspect of DOT 3&5, but when I switched from 3 to 5, I flushed the system with alcohol per the instructions before re filling with Dot 5.

If the jell doesn't flow easily, I would guess that you will need to remove the calipers and dissasemble them to clean out the jell, ditto the M/C, then use compressed air to blow the jell out of the lines, then flush well with the alcohol.

I doubt that the jell has attacked the rubber, as either fluid is compatible with the rubber parts by itself.

Having said all that, I must state that I did all this 16 years ago when I first got the 72. My memory just ain't what it used to be, for sure!

Good Luck

NJ BB Ken

what type of alcohal? Is Busch ok? No seriously, do I use like a denatured alcohal? What's the best way to completly flush the system?

seathree said: what type of alcohal? Is Busch ok? No seriously, do I use like a denatured alcohal? What's the best way to completly flush the system?

I have used plain old 35 cent a bottle rubbing alchohol and havent had a problem...

Also you might use an air nozzle..

just blow compressed air through

updated for typos/spelling

|UPDATED|8/18/2004 2:21:15 PM (AZT)|/UPDATED|

The rubber will be fine. It won't hurt it. Any oil will distroy the rubber.

As far as flushing, I would use the air, then the alcholol, then the air again. You may want to disassemble the calipers. That's a judgement call.

kstyer said: You may want to disassemble the calipers. That's a judgement call.

you could just try flushing/blowing each caliper with each bleeder/plug out one by one..

this should clean the whole path..

Let us know if just an air and alcohol flush works. I'd be concerned as to whether or not it all came out. The bleeder holes are smaller than the passages in the calipers.

daveb12 said: Let us know if just an air and alcohol flush works. I'd be concerned as to whether or not it all came out. The bleeder holes are smaller than the passages in the calipers.

id remove those bleeders one by one..

i would think any gel funk would come out a 3/16th hole.

With the bleeders out, it probably will come out. It's worth a try. As I said it's a judgement call. Only you can see how jelled it is.

Since you said you were going to DOT 4, If it was me, I'd dissasemble the calipers & M/C to remove all the jell, then as suggested elsewhere, use compressed air to blow out the lines, then flush with the alcohol.

As I previously posted , my memory fails me as to the type of alcohol, although I think it may have been Jack Daniels. ( Just kiddin', I really think it was de-natured alcohol.)

The last time I looked at a rubbing alcohol bottle, a decent % was water. Don't think I'd want to chance leaving any residual H2O around in the bottom of the calipers or M/C internals when adding DOT 4 fluid.

Just my $.02

Cheers



NJ BB Ken

|UPDATED|8/19/2004 12:02:28 PM (AZT)|/UPDATED|