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I have a 1996 Toyota T100,I bought a new master cylinder. bleed the brakes, but pedel is a little hard until u start the truck. Then the pedal goes down soft. whatn is going on?

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Still need to bleed the brakes have air in system

Posted on Apr 19, 2017

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Gday and happy new year hope you may have some advice that may help me with a problem im having i bought a disc brake conversion kit for my 64 bird we fitted up the kit with new lines the ki


First of all, I hope you got a new master cylinder with your disc brake kit. A new master cylinder should be bled before connecting the brake lines and then never allowed to pull in air during the rest of the bleeding process. A couple of fittings ans hoses should have come with the new master cylinder [see the kit listed for a picture]. If the master cylinder has an air bubble, you won't be able to properly bleed the rest of the system.
For the rest of the system you can make up a small catch bottle like the one pictured in the one man brake bleed kit; make sure the hose goes tot he bottom of the catch bottle. You have to cap the master cylinder reservoir before pumping the brakes or fluid will squirt out and all over; brake fluid is a like paint remover. Then start with the brake farthest from the master cylinder and bleed fluid out by having a buddy pump the brakes while you hold the catch bottle above the bleeder port so no air gets back in. [hint, put some pipe teflon tape on the outer threads only, not the inner end of the bleeder screws to seal the threads]. Check the master cylinder level often! If the brakes still are spongy after the first round of bleeding, have a buddy pump up the brake pedal with the bleeder screw closed and hold pressure on the pedal; you then open the bleed port until the pedal goes to the floor; have your buddy hold down the pedal until you close the port. Repeat on all brakes until the pedal is firm.

Jan 26, 2015 | Cars & Trucks

1 Answer

Replaced brake lines and master cylinder after bleeding lines I still have no brakes what do i need to do to get brakes back?


a key might be the brake pedal.
if it goes to the floor easily it is not connected to MC or MC isn't functioning or there is a massive leak.
If it goes to the floor with resistance than there is still air in the lines.
If it drops 1-2 inches and stops hard than look at the brakes to see if they r moving. could be an obstruction in the line.

Sep 21, 2014 | 1993 Toyota T100

1 Answer

I have to press very hard to get the brakes to work. If i pump the brake pedal the brakes seem to work better for that application, but I still have to press very hard on the pedal to get the brakes to...


I suggest replacing the master cylinder assuming that you bled the system properly. You sound competent so it seems likely that the seals in the MC might be failing. That being said the brake lines can hold a lot of air :)

Aug 23, 2010 | 1993 Toyota T100

2 Answers

How to bleed the brakes on a1999 chevrolet venture van instaslled new brake pads on front tired to bleed brake pedal all the way up when van not running - goes to floor when van is running


Start with brake in the rear that is the farthest away from the master cylinder ( if your master cylinder is on drivers side start with passenger rear,pump up brake pedal until hard have someone else open bleeder valve until air or fluid squirts out,while holding brake pressure even if goes to the floor dont release pedal until bleeder valve is tightened or you will **** air back into the line,do this several times making sure you get a full stream of brake fluid and no air,continue to other rear wheel and then proceed to front wheel furthest from master cylinderand then final wheel. if you still don't have brakes change master cylinder and bleed all brakes again.

Jul 05, 2010 | 2000 Chevrolet Venture

4 Answers

No brakes


the master cylinder must be bled before installation. why did you replace the master cylinder? check this site out. lots of good info.
http://www.aa1car.com/

Apr 12, 2010 | 1990 Toyota 4Runner

1 Answer

Installed new master cylinder can't get the brakes blead.


There are two solutions offered here. Please read them both before starting.

1. Find a helper. Take the brake lines back off the master cylinder. Make sure the fluid reservoir is full. wearing safety glasses and rubber gloves press your thumbs on the holes in the master cylinder where the lines hook up. Have your helper push the brake pedal down. Keep doing this until the fluid pressure moves your thumbs away from the master cylinder and squirts out of both the front and rear holes. Work with your helper to hook up the lines without loosing the fluid in the master cylinder. Check the fluid in the master and fill it up. DO NOT ASSUME YOU HAVE BRAKES. Test the brakes carefully. If they are still spongy you have to bleed the lines at the wheels. Start with the longest line and work to the shortest. Bleed all four one at a time until you have a steady stream of fluid coming out when the pedal is pushed. Then carefully test the brakes. If the pedal is good you can drive the vehicle.

2. If you can't find a helper or are worried about fluid squirting around the shop you can do the same thing by making two short lines for the front and rear master cylinder openings and submerging the lines in a pan of fluid. Pump the brakes until no air bubbles up in the fluid and fasten the lines as per above. once again DO NOT ASSUME THAT YOU HAVE BRAKES UNTIL YOU CAREFULLY TEST THEM. Bleed the lines as described above if you are not happy with the pedal feel. Good Luck.

Mar 20, 2010 | 1997 Toyota T100

2 Answers

Brake pedal still goes to floor 2000 GMC Jimmy


It's very possible to be the master cylinder, the o-rings on the piston could be worn, letting the fluid seep back through instead of getting full pressure through the lines. Could also be the brake booster.
Try changing the master cylinder first, which is cheaper and easier, and see if there is a difference, you'll need to bleed the brakes again.
To check the booster,
With the engine off, pump the brakes until the pedal is hard, then hold pressure on the brake pedal and listen for air escaping, or the pedal goes slowly to the floor, Do that after the master cylinder has been changed, at least that will be eliminated.

Sep 15, 2009 | 2000 GMC Jimmy

2 Answers

I put new brakes and rotors on the front of my Toyota 4Runner and new rear wheel cylinders on and I bled the brakes but there still seems to be air in them. What can be the problem


You are correct there is still air in the system. It is a two man job starting at the right rear and then left then front. Pump brake pedal then hold down while bleeder is opened then closed before pedal let off. Then repeat till no air. Be sure to check master cyl for fluid and keep it filled during process.

Sep 14, 2009 | 1996 Toyota 4Runner

1 Answer

1996 T-100 dash brake light will not go out


The brake fluid level sensor in the master cylinder is stuck in the lower position which completes the circuit to illuminate the light.. Try tapping lightly on the side of the reservoir to loosen it. If that does not help, you will need to replace the level sensor.
Thanks for choosing FixYa for assistance.

Jan 25, 2009 | 1996 Toyota T100

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