Brakes won't bleed after master cylinder replacement

[NateDog99]

Hi guys I just recently replaced the Master Cylinder on my 99 Wrangler TJ and I’m trying to now bleed the brakes but the pedal is very hard and I can’t seem to get brake fluid to come out of bleeder valves. I made sure to bleed the master cylinder as well as cleaning out the bleeder valves. Would really appreciate some help on this.

 

[Apparition]

Try the brakes instead

 

[Chris]

@mrblaine

 

[NateDog99]

Try the brakes instead

Oops you’re right lol didn’t even realize

 

[Gilaguy23]

You sure the bleeders arent plugged up with rust or muddy crap?. I've had that happen more than once. Especially the inner orifice which can get rusty crusty.

 

[Apparition]

Oops you’re right lol didn’t even realize

Just messing with you. Once Blaine shows up you'll have the help you need.

 

[NateDog99]

You sure the bleeders arent plugged up with rust or muddy crap?. I've had that happen more than once. Especially the inner orifice which can get rusty crusty.

I fully unscrewed the bleeders and sprayed brake clean through them so they seem to be ok.

 

[NateDog99]

Just messing with you. Once Blaine shows up you'll have the help you need.

Thank you

 

[mrblaine]

Hi guys I just recently replaced the Master Cylinder on my 99 Wrangler TJ and I’m trying to now bleed the brakes but the pedal is very hard and I can’t seem to get brake fluid to come out of bleeder valves. I made sure to bleed the master cylinder as well as cleaning out the bleeder valves. Would really appreciate some help on this.

Open the bleed screw much further. If that doesn't work, pull the bleed screw and make sure the little hole on the side above the tapered end isn't collapsed from over tightening or is missing.

If that is good, then loosen the banjo and have someone push the pedal to see if fluid is able to come out around the banjo. Keep working upstream until you find where the flow starts.

 

[NateDog99]

Ok thank you for the reply I’ll try that and update after

 

[macleanflood]

Shuttle valve or possibly old brake hoses?

-Mac

 

[mrblaine]

Shuttle valve or possibly old brake hoses?

-Mac

The shuttle wouldn't give you a hard pedal.

 

[Intimnasc]

Not sure what could possibly have been installed wrong but are you sure you installed everything correctly on the master cylinder? Isn't there a push rod or plunger or something that goes into the booster? Damn sad been 20 years since I've had to change one just can't remember.