the Dune Buggy Archives
DBA Forum - Not logged in
Previous Next Up Topic Public / General Discussion / Left front wheel locks up during braking (336 hits)
By Paul Moran (DBA Architect) Date 2019-05-08 03:04
This problem has been getting worse for 1-2 years now. The left front wheel on my black Imp locks up when I brake and pulls to the left. In the past I have pumped the brakes hard at a stop and then it seems better for a bit. When I took the buggy out Sunday for the first time this season, it is very hard to stop as it seems the left front is doing all the work and with no weight in the front, it locks up and slides.

I have Neal discs on the back and stock '65 drums on the front with braided flex lines. I don't want to put a lot of money into the fronts as I want to swap them to discs. But I have heard all front discs push the wheels out and the tires barely fit inside the front fenders as it is so I suspect I'll need a narrowed (and adjustable as I have now) beam.  Feels like a big job, but I think I could set most of it up new off the buggy and then swap it in one piece - hook up brake lines and steering - and be back on the road.

But if I could get it to stop again (it used to stop great) with something simple, I'd prefer to go that route.  It's also hard to do any testing on my own... 

Any thoughts on where to start?
Thanks, Paul...
Chicago, IL
EMPI Imp 1002 ('69)/Subaru EJ20 Turbo/LinkPlus ECU
By Evan M #82 Date 2019-05-08 11:50
Paul it could be as simple as just needing adjusted to a complete brake job. Only way you will know for sure is to pull the brake drums off and check them out.
Evan
By Paul Moran (DBA Architect) Date 2019-05-08 12:01
Thanks, Evan- and that is the challenge. I pulled the drums off last summer and everything looked fine. The drums spin free and when I apply the brake they stop...
Chicago, IL
EMPI Imp 1002 ('69)/Subaru EJ20 Turbo/LinkPlus ECU
By Ron S 3875 Date 2019-05-08 14:43
Follow and view the brake lines themselves running from the master cylinder to each of the brakes.  Look for rust, oil, and dents.
Old lines can rust out (inside and out) and partially plug on one side shifting the braking to the other. 
I have even seen where I can fully bleed all four lines and still get one brake locking.
It was only when I found oil and rust on a line that I could see very slow seepage and after a really hard emergency push on the brakes did it finally burst.
By Paul Moran (DBA Architect) Date 2019-05-08 15:18
Thanks Ron-I'll follow all the lines. They are all stainless steel hard lines except for the very short joint connecting the long front to rear line with the splitter at the rear. I can picture how a dent could cut off flow. I have done some very hard pushes on the brakes in case a wheel cylinder might be stuck closed and the pressure is very good thanks to the braided stainless flex lines. Paul...
Chicago, IL
EMPI Imp 1002 ('69)/Subaru EJ20 Turbo/LinkPlus ECU
By Lloyd B 2301 Date 2019-05-09 04:06
Just a Question Paul, do you have a proportioning valve on your brakes?  Just something we deal with in our Old Internationals when we have drum and disk together.

lloyd
By Paul Moran (DBA Architect) Date 2019-05-09 04:08
Hey Lloyd-I have not put a proportioning valve in yet.  I'd like to.  Any suggestions on brand and model? Paul...
Chicago, IL
EMPI Imp 1002 ('69)/Subaru EJ20 Turbo/LinkPlus ECU
By Ron S 3875 Date 2019-05-09 15:11
I had used one of these in the past after a partial disc swap out. 

https://www2.cip1.com/ProductDetails.asp?ProductCode=C13%2D16%2D3157

Nice as they are adjustable.  But, with your pulling being one sided as you describe, I expect something else is going on.

How old are the slave cylinders.  The a piston can (after wear) bind on one side.

I will make the assumption that you have fully examined all the brake parts at each wheel, the drums, shoes, springs, retaining clips and adjusters.....
By Lloyd B 2301 Date 2019-05-09 16:03
Paul, these other guys have better information than I do, I just "pick" up on some of this while being admin on the OldIhc Forums.   Life changes, I no longer have any of my toys.  My 67 cougar is gone, my Jefferies Dune buggy is gone, My International is gone.  Now live in an RV Full time and on the road.  Still enjoy reading about all you guys and your adventures and helping when I can.
Previous Next Up Topic Public / General Discussion / Left front wheel locks up during braking (336 hits)

Powered by mwForum 2.10.2 © 1999-2007 Markus Wichitill