130 psi - won't pop

[greg maz]

last but not least of my calipers to get cleaned, no boom.
Compressor gives 130 max what now? The alternative mc procedure won't give that much pressure.
TC said go to a gas station, but I doubt their nozzle will fit.

[DiverRay]

Screw a grease fitting into bleeder hole, plug the brake line fitting with a 10mm bolt, and use your hand grease gun on it. It WILL fill the caliper with grease, but it also puts out 3,000 PSI !!

[greg maz]

don't own one yet

if it is the fix, I'll have to wait for more bread then

doh!

I should take a trip to some shop... didn't know grease guns were deadly

[AlanB]

Hi Greg,

Hook it back up to the master, get it bled, and pump it out; with a good squeeze on the lever, you can pump up a whole lot more than 130 psi.

If a strong hand and some hydraulics won't shift it........ It is not coming out!

Air being released from 150+psi can propel that piston faster and further than you might believe, and all in a corosive, paint-destroying mist of air propelled brake fluid.


The lack of compressability of the brake fluid makes the eventual "POP" totally non-dramatic.

AlanB

[greg maz]

this is the front left caliper of an xj, hence connected to the rear mc. Will try it. Thing moves but stopped at 2/3rds. Same is happening for 2 other spares that I have.

BTW, anybody to comment on the rear mc controlling with a front brake. Any trick to riding properly? Should it get modified (xs front mc with dual lines).
It makes me nervous: the brochure stating "...front and back brakes controlled from the pedal... if the rider desires more stopping he will then apply the front brake via the right lever..." or so.
My habits are opposite + I don't won't my front to lock or skid (gravel).

[DiverRay]

If you do a search, you will find a few people have "modified" the XJ to work like the earlier XS machines. As I ride a '79, I have NOT done the mod, so I cannot comment on it.

[greg maz]

came out

no biggy, did it by switching to front mc

next is bleeding front left caliper connected to rear mc

is there a one man trick to that?

will search for xj modif pro & cons

muchas gracias para todo info

[greg maz]

sorry can't find info on the integral braking, apart from its name and that is has some effect at low speed
comments welcome

[AlanB]

Hi Greg,

Glad you got it; as I said, if hydraulics won't get it, nothing will.

AlanB

[TopCatGr58]

Hey Greg,

I don't recall any advice about taking it to a gas station? No matter!

Now, searching for "linked Brakes" reveals several threads.

Notes about plugging one of the rear MC outputs so you can run it just to the rear caliper. Concerns about trying to run both calipers from the XJ's front MC is that it wasn't designed to drive the capacity of 2 calipers, it's smaller than the XS11's! However, folks have found that once they installed Stainless Steel braided lines, that there was NO loss of pressure/volume thru line expansion, and that the XJ front MC was able to handle both front calipers.

Others have opted for aftermarket 16mm bore or XS11 front MC's in place of the XJ's! YMMV!
T.C.

[Ken Talbot]

Originally posted by TopCatGr58
I don't recall any advice about taking it to a gas station?

That was me a bit earlier - I did this one time. I cut the valve stem off an old bicycle inner tube, pressed the rubber end against the hose attachmelt hole, then hit the other end with the air chuck. Sure was glad somebody before me had suggested lots of rags between the piston and the caliper body, and keeping fingers out of the way.

[greg maz]

the trip to the gas station was from another thread, when the compressor was unavailable - for the records. But, then again, I might have taken you for somebody else.

I noticed the small size of the xj front mc for a single caliper use, this is why I thought of an xs replacement. But the steel lines trick is good news.

As for plugging the rear mc, what can be used?