RezVek
Member
- Joined
- Jul 27, 2021
- Messages
- 33
First time poster here. Let me start by saying I am in the middle of Canada so my resources for a local knowledge base are very limited, even more limited when dealing with a PM. I am NOT a mechanic and the closest thing i was to a mechanic before owning my 87GN is that i bought some tools. I feel i have learned a lot from forums like this as I have been reading them for a couple years since I first got my GN and it has always been a great source of info!
Right now, I am having an issue with my PM brakes and can’t find a related issue. Please note that during this whole ordeal, the brake light never comes on(but it does work when i apply the emergency brake), which is making this hard to follow troubleshooting procedures as most reference “is the light on?”. The other day I was getting ready for a show and moving vehicles around and my GN had a hard pedal. I got my cars moved around and checked the PM, it had some oily moisture on the top of the reservoir cover and in the plug socket at the top (pressure switch?). I cleaned that all up and once I was ready, I headed to the show and part way there, hard pedal almost no brakes. I came to a stop and checked the PM, pulling the connector at the top off(pressure switch?) and resat it, got back in and brakes seemed ok. Decided to head home and the brakes were fine for the 10-15 min drive so I turned back around and headed back to go to the show, no problems. After the show, I was nervous for the drive home, but no issue.
Last year I did “clean” the fluid by a method I found on Youtube where I would pump the brake 10-12 times, drain and refill the fluid, pump, drain/refill, and repeated till the full reservoir fluid was clear. This all worked fine then (last spring) and no issues all last year, even for a couple drives this year.
Now, key off, the pedal is hard immediately when I did the 10-12 pumps and checked the reservoir and it was not even half full(keep in mind that other than the bit of fluid I found, there is no evidence that half the fluid escaped. I topped the fluid in the reservoir and went key on. The PM cycled for 2-3 secs and stopped, leaving the reservoir about half full. Did this a few times, not adding more fluid as there is likely too much already, with same results. At this point it seems something “non electronical” leading me to think the accumulator is holding fluid. But i thought i would test the switch at the top of the PM as per a guide I found and I had no continuity between any of the 3 pins. So, I do know some GN guys and most cars have been converted to vacuum or hydra. I borrowed a switch and it had continuity so I swapped it out, same issue. My switch now bench tests fine and his no longer has continuity in the car. I pulled it and it tested fine again, so I put mine back in. Of course , same issue.
I tested the brakes in the driveway and they are 100% fine. I have working brakes that don’t seem softer or harder than usual with engine running, but I know there is an issue. I am not overly comfortable driving it, knowing they could fail at anytime.
I could get a switch and ball to the tune of about 450-500 (USD, much more in my crappy Canadian dollar!). But I don’t even know what the issue is! I hate to just throw money at it, not knowing the root cause. Do I cut my losses and just convert to vac? hydra? I don’t race but want it to perform. Any Canadian sites sell these units(vac or hydra)?
Any and all help is welcomed!
Right now, I am having an issue with my PM brakes and can’t find a related issue. Please note that during this whole ordeal, the brake light never comes on(but it does work when i apply the emergency brake), which is making this hard to follow troubleshooting procedures as most reference “is the light on?”. The other day I was getting ready for a show and moving vehicles around and my GN had a hard pedal. I got my cars moved around and checked the PM, it had some oily moisture on the top of the reservoir cover and in the plug socket at the top (pressure switch?). I cleaned that all up and once I was ready, I headed to the show and part way there, hard pedal almost no brakes. I came to a stop and checked the PM, pulling the connector at the top off(pressure switch?) and resat it, got back in and brakes seemed ok. Decided to head home and the brakes were fine for the 10-15 min drive so I turned back around and headed back to go to the show, no problems. After the show, I was nervous for the drive home, but no issue.
Last year I did “clean” the fluid by a method I found on Youtube where I would pump the brake 10-12 times, drain and refill the fluid, pump, drain/refill, and repeated till the full reservoir fluid was clear. This all worked fine then (last spring) and no issues all last year, even for a couple drives this year.
Now, key off, the pedal is hard immediately when I did the 10-12 pumps and checked the reservoir and it was not even half full(keep in mind that other than the bit of fluid I found, there is no evidence that half the fluid escaped. I topped the fluid in the reservoir and went key on. The PM cycled for 2-3 secs and stopped, leaving the reservoir about half full. Did this a few times, not adding more fluid as there is likely too much already, with same results. At this point it seems something “non electronical” leading me to think the accumulator is holding fluid. But i thought i would test the switch at the top of the PM as per a guide I found and I had no continuity between any of the 3 pins. So, I do know some GN guys and most cars have been converted to vacuum or hydra. I borrowed a switch and it had continuity so I swapped it out, same issue. My switch now bench tests fine and his no longer has continuity in the car. I pulled it and it tested fine again, so I put mine back in. Of course , same issue.
I tested the brakes in the driveway and they are 100% fine. I have working brakes that don’t seem softer or harder than usual with engine running, but I know there is an issue. I am not overly comfortable driving it, knowing they could fail at anytime.
I could get a switch and ball to the tune of about 450-500 (USD, much more in my crappy Canadian dollar!). But I don’t even know what the issue is! I hate to just throw money at it, not knowing the root cause. Do I cut my losses and just convert to vac? hydra? I don’t race but want it to perform. Any Canadian sites sell these units(vac or hydra)?
Any and all help is welcomed!
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