Fun with wheel cylinders

Omni

Active Member
Joined
Feb 24, 2021
Messages
212
Reaction score
192
Location
43567
Good Day All
While the party barge ('65 Newport) is in dry dock, I thought that this would be an opportune time to finish replacing the wheel cylinders.
The project was to refurbish the brake system with new lines (flex and hard-not stainless), and new cylinders to include the master. The front cylinders and lines were no problem. The rear however, took a couple of days. The rear hard lines were close but a little to long on the drivers side. Not a problem as I have a double flare tool. With the lines installed the nut would bottom out against the cylinder before the flare would seat. Removed the line again, replaced the 'short' nut with a 'long' nut and try again. Once reinstalled the nut would tighten but the fitting would leak between the nut and the tube, When I install hard lines I use a dab of Loctite 567(?) on the tube. Slide the nut up and turn it to distribute it around the tube. I also use a dab on the threads.
One again the line comes off. I clean everything examine the double flare (no issues noted) and reinstall. Same result; leakage between the nut and tube. One more time the line comes off. I now remove the drum and disassemble the brake hardware,and remove the cylinder. I measure the depth of the seat and it is 3/32 deeper that the original. I also notice that the seat in the cylinder has what appear to be serrations on the face of the seat.
I return the offending cylinder back to the parts store and pick up another one (along with some more brake fluid). The seat depth is still 3/32 deeper but the face of the seat appears to be smooth.
Once home I reinstall everything and bleed the brakes. I block the brake pedal with some wood to keep pressure on it and leave it for 6 hours. (The battery is out of the vehicle). After 6 hours all is well.
The take-away is that you need to inspect EVERYTHING when dealing with Chineesium parts.
Merry Christmas to All
Omni
 

Grannys67

New Member
Joined
Aug 13, 2019
Messages
47
Reaction score
81
Location
St. Louis
Not a shocking story with lots of parts store brake parts these days unfortunately.
I once got a cylinder from o'reilly with a bleed screw in it that didn't have a bleed hole drilled in it... so basically a plug nut. I'm like wtf.
Glad it worked out for you!
 

bigmoparjeff

Senior Member
Joined
Aug 9, 2017
Messages
2,509
Reaction score
3,331
Location
Dublin, PA
It doesn't take much of a defect on the seat to cause problems.

Glad that you got it sorted out.

Jeff
 

bluefury361

Old Man with a Hat
Joined
Mar 9, 2011
Messages
14,090
Reaction score
16,231
Location
Alabama Gulf Coast
Unless the bores on your original cylinders are badly pitted I recommend rebuilding them. The chinese castings are not up to the original standards. Seal kits are easy to find.
 
Top