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Scion xB Suspension, Chassis & Brakes Questions and answers about Scion xB suspension, chassis, & brake upgrades! You have to admit the box looks mighty fine when dropped. This is where you get the details for Scion xB suspension, chassis, & brake alterations.

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Old 06-16-2011, 02:39 PM   #1
rlarson
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soft brake pedal help

Changed the front brake pads on my 2006 xb Monday night, i forgot to completely tighten the passenger side bleeder valve and proceeded to leak brake fluid up and down the street as I was trying to build pressure up in the brakes. I tightened the valve back up, and filled the reservoir back up with fluid. It has been 2 days but the brake pedal is still very soft. The car stops ok, but it's kind of scary. Any suggestions as to what is going on?
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Old 06-16-2011, 03:17 PM   #2
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Re: soft brake pedal help

You have air in the lines. Do you know how to bleed brakes?
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Old 06-16-2011, 03:30 PM   #3
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Re: soft brake pedal help

I'll assume you don't. Get an assistant. Even a 10 year old neighbor will do.

Crawl under the car with bleeder wrench in hand.

Have your assistant pump on the brakes ten times and keep pressure on the pedal, while you loosen the bleeder on the rear brake farthest from the master cylinder. As you open the bleeder, brake fluid and air will exit the bleeder, and the pedal will drop to the floor. Tell your assistant to keep the pedal there, while you tighten the bleeder. Repeat the pump and bleed until only fluid comes out.

Check your brake fluid level in the master cylinder and refill as necessary. Be sure to use a new can of Toyota-spec brake fluid.

Move to the other rear brake and repeat the pump and bleed, and the brae fluid check.

Move to the front brake farthest from the master cylinder. Repeat the pump and bleed, and brake fluid check.

Repeat on remaining brake. Your brakes should be firm again.
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Old 06-16-2011, 03:32 PM   #4
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Old 06-16-2011, 03:35 PM   #5
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Re: soft brake pedal help

If you can't find an assistant, you can buy a one way check valve and hose that will let you do the bleeding alone. You drop the hose end into a glass or plastic bottle, and you don't drip brake fluid on the street/driveway/garage floor.
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Old 06-16-2011, 04:40 PM   #6
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Re: soft brake pedal help

Quote:
Originally Posted by BestmpgxB View Post
I'll assume you don't. Get an assistant. Even a 10 year old neighbor will do.

Crawl under the car with bleeder wrench in hand.

Have your assistant pump on the brakes ten times and keep pressure on the pedal, while you loosen the bleeder on the rear brake farthest from the master cylinder. As you open the bleeder, brake fluid and air will exit the bleeder, and the pedal will drop to the floor. Tell your assistant to keep the pedal there, while you tighten the bleeder. Repeat the pump and bleed until only fluid comes out.

Check your brake fluid level in the master cylinder and refill as necessary. Be sure to use a new can of Toyota-spec brake fluid.

Move to the other rear brake and repeat the pump and bleed, and the brae fluid check.

Move to the front brake farthest from the master cylinder. Repeat the pump and bleed, and brake fluid check.

Repeat on remaining brake. Your brakes should be firm again.
This can be done without removing the tires right?
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Old 06-16-2011, 05:13 PM   #7
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Yeah, the bleeder valves are behind the brakes. So no tires need to come off if you can reach the bleeder valves
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Old 06-17-2011, 10:28 AM   #8
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Re: soft brake pedal help

Quote:
Originally Posted by BestmpgxB View Post
Check your brake fluid level in the master cylinder and refill as necessary. Be sure to use a new can of Toyota-spec brake fluid.
You can use any DOT3 brake fluid and that will do just fine. I used Penzoil when I refilled mine. Some people say they prefer DOT 4 or higher, but you would have to drain the entire systemt and the stock brake lines and master cylinder are not designed for this fluid.

I would also like to note that for the majority of brake pad replacements out there you DO NOT(and should not) need to mess with bleeding the fluid at all. People always "feel better" with new fluids, but if you don't have any problems (i.e. leaky calipers, soft pedal, etc.) don't mess with the system. I ended up doing mie do to my 4x SS brake line replacement and rear disc brake conversion...in this case it was necessary.
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Old 06-21-2011, 12:01 PM   #9
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Re: soft brake pedal help

Thanks for the help everyone, bled the lines the other night and they work great now!
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Old 06-21-2011, 12:11 PM   #10
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Re: soft brake pedal help

Glad I could help. Enjoy!
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