please help asap, need car for work
please help asap, need car for work Just installed new master cylinder. Well, I installed the master, and have master cylinder line to slave disco. I am pumping the pedal, about 5 to 10 times, and then Holding to floor, wife pushes in on center of quick disco and fluid comes out. We have done this about 20 times, and pedal is not getting stiffer 
What could be going on? Fluid is coming out, not leaking (I felt with my hand up by master cylinder) but it's not building pressure! Please help asap, need car for work.
What could be going on? Fluid is coming out, not leaking (I felt with my hand up by master cylinder) but it's not building pressure! Please help asap, need car for work. Obviously it could be a bad master, but doubtful. Check the line going from the master to the reservoir. It should be zip tied/hose clamped at the reservoir. I'm assuming you bought an aftermarket master and not a GM one. Your best shot with these is to fill them as much as possible with fluid, seal them up, bench bleed as much as possible and install them assembled. On technique I've heard works is to hang the master cylinder from the hydraulic line, depress the disconnect fitting and fill through the hydraulic line.
Don't disconnect the reservoir. Make sure you put the o-ring on the hyrdraulic line at the bottom of the master and that it's not leaking. Don't even bother to connect it to the slave until you get the air out of the master or you'll just move the air around the system. Also, the parts stores I dealt with were terrible about getting me the right master. I went through 2 with 2 different part numbers, neither of which worked. I'd call the manufacturer of your master and make sure it's the right one. Eventually I coughed up the $200 and went straight to the dealer for the GM master. It comes with the reservoir and hydraulic line and is pre-bled.
Don't disconnect the reservoir. Make sure you put the o-ring on the hyrdraulic line at the bottom of the master and that it's not leaking. Don't even bother to connect it to the slave until you get the air out of the master or you'll just move the air around the system. Also, the parts stores I dealt with were terrible about getting me the right master. I went through 2 with 2 different part numbers, neither of which worked. I'd call the manufacturer of your master and make sure it's the right one. Eventually I coughed up the $200 and went straight to the dealer for the GM master. It comes with the reservoir and hydraulic line and is pre-bled.
Not leaking. Put the o-ring in. Has zip tie from reservoir to master, but the line that goes to MC is NOT zip tied. But fluid IS going through, and not leaking, so SHOULD be fine.
Okay, doesn't need a zip-tie/clamp on the line at the master. Could try keeping the quick connect submerged in fluid and pumping the clutch with it open. Then release the quick connect while it's submerged. Just make sure you dont run the reservoir dry. As much as it sucks to take back out, your best bet might be to bench bleed it.
I would take it out and bench bleed it. This same thing happened on a friends car. We tried repeatedly to bleed it while on the car and it wouldn't. Turns out, the way the tubing on the master is routed, you can get a small air pocket in the line. The fluid will bypass this air pocket and will come out of the quick connect at the other end so it gives you the impression that you are bleeding it. As much as it sucks, I would go ahead and pull the master out and bench bleed it.
Originally Posted by Mike44138
your best bet might be to bench bleed it.
you guys are right on the money. I actually decided to take out (Before saw posts) and within SECONDS of pumping it out of car was so firm, I could NOT push it in at all. So then put in car, could NOT push clutch pedal down hooked to slave pumped 5 or 6 times, had wife hold pedal down opened bleeder closed, and BAM! NICE pedal feel.
Then, took for a drive, and before with **** master cylinder I bought from tippman243
would NOT go into Reverse, clutch engaged about 1/2 inch off the floor. NOW will take some getting used to, goes into EVERY gear smooth, 4th grinds a Little, but think is synchro or something, reverse is EASY, clutch engages when pedal is a little more than halfway up. Kinda weird, but it's a LOT better. Thank you all.
hooked to slave pumped 5 or 6 times, had wife hold pedal down opened bleeder closed, and BAM! NICE pedal feel. Then, took for a drive, and before with **** master cylinder I bought from tippman243
would NOT go into Reverse, clutch engaged about 1/2 inch off the floor. NOW will take some getting used to, goes into EVERY gear smooth, 4th grinds a Little, but think is synchro or something, reverse is EASY, clutch engages when pedal is a little more than halfway up. Kinda weird, but it's a LOT better. Thank you all. Trending Topics
hey man ive been follwing ur issues with ur clutch and im having very similar issues. check out my problem. https://ls1tech.com/forums/manual-transmission/365732-more-issues-early-engagement.html
i switched to the mcleod and it didnt fix it and i keep loosing my pedal if i drive it for more than 2 shifts. what EXACTLY did u do? did u bench bleed it all over again or just un hook it and start pumping it til it got hard?thank u in advance.
sorry i tried to pm u but ur inbox is full.
i switched to the mcleod and it didnt fix it and i keep loosing my pedal if i drive it for more than 2 shifts.
what EXACTLY did u do? did u bench bleed it all over again or just un hook it and start pumping it til it got hard?thank u in advance.sorry i tried to pm u but ur inbox is full.
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Ls2, if your peddle is firm and then goes soft after more than 2 shifts you've got a leak in the hydraulic system somewhere. It's either leaking fluid or sucking air. Check the connection at the reservoir, at the hydraulic line at the bottom of the master, and at the slave where the hydraulic line connects. Look for fluid leaking from the bell housing.
You need to make sure you've got the master completely bled before you connect it to the slave. You'll know it's right when you remove the hydraulic line from the slave and it's impossible to depress the peddle. If you can move the peddle there is air/contaminants in the system or you have a bad master.
If you need some more help start up a thread and I'll help you troubleshoot it.
You need to make sure you've got the master completely bled before you connect it to the slave. You'll know it's right when you remove the hydraulic line from the slave and it's impossible to depress the peddle. If you can move the peddle there is air/contaminants in the system or you have a bad master.
If you need some more help start up a thread and I'll help you troubleshoot it.
yeah only 4th gear synchro. I've got a baby on the way, and some other minor issues to sort out. I think once all is sorted out, I will go ahead and have tranny rebuilt with steel 3-4 shift fork, and new 4th gear synchros. Thanks again for help.
Ls2, I pulled master cylinder out, and pumped all the way up all the way down, and it makes sense. THink about it. With MC in, and attached to clutch pedal, rod is not going ALL the way in so you still have SOME air trapped in there. Well, with it not attached to the clutch pedal you can go ALL the way down and get ALL the air out. After bench bleeding I put it in, and i could NOT push clutch pedal down AT ALL until I attached to slave cylinder.
Ls2, I pulled master cylinder out, and pumped all the way up all the way down, and it makes sense. THink about it. With MC in, and attached to clutch pedal, rod is not going ALL the way in so you still have SOME air trapped in there. Well, with it not attached to the clutch pedal you can go ALL the way down and get ALL the air out. After bench bleeding I put it in, and i could NOT push clutch pedal down AT ALL until I attached to slave cylinder.