Question about Lexus SC 400

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Brake pedal goes all the way to the floor, will slow the car a little, but wont fully brake. master cylinder is fine, calipers and pads are new, brake lines look okay, it's holding brake fluid fine, lines have been bled multiple times, and we can't find a leak anywhere. Any ideas why my brakes still wont work? I'm pulling my hair out trying to figure this out! Thanks!

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Must be something you have overlooked. clamp off the front brake hoses and rear hose. if you dont have the propper clamps use g clamps or locking pliars. try the pedal then. if it still goes to the floor its either air in the lines or the master cylinder is no good..Bleed the master cylinder at the lines first,then work back.

Posted on Mar 11, 2011

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I have a 23 t bucket and i cant get a brake pedal.when i bought it had very little brake so i replaced rear shoes and cylinders,front pads and calipers,all new lines and the master cylinder


Once you have bled the air from the brake lines,clamp off the front brake hoses carefully.Does the pedal feel better now?
Then the pad /caliper fit is allowing too much play.Is the pedal the same?Then clamp the rear hose and try the pedal.Is it fine with the rear hose clamped?If so we now know the problem is at the rear brakes.One common low pedal rear brake cause is brake shoes that do not fit the drums.Remove the drums and look at the shoes,are they showing contact wear fully or just in the middle of the shoe?Remove a shoe and place it in the drum.Can you rock the shoe against the drum surface?Once drums have been resurfaced,the shoes will not fit fully against the drum allowing the shoe the flex when applying pressure to it and this can easily create a low soft brake pedal. Of course rear brake adjustment must be correct once brake shoe contact is correct.To correct brake shoe contact,have your shoes re arc-ed to fit resurfaced drums or install new drums.Don't overlook brake master cyl /brake pedal push rod adjustment too.

Jun 24, 2017 | Cars & Trucks

2 Answers

2005 Camry. Having difficulty when I apply brakes. Pedal goes almost to floor. Eventually stops. Had brake pads, drums and calipers checked, they seem fine. Any suggestions ?


Low brake pedal almost always indicates a compromised hydraulic system. Check you brake fluid level. If it is ok and you haven't had anything replaced in the brake hydraulics system lately, such as a wheel cylinder or brake caliper, then the primary suspect is the master cylinder.

Jan 02, 2015 | Cars & Trucks

1 Answer

My 1998 ford taurus brake pedal goes straight to the floor .


Brake line busted somewhere? Is the linkage to the master cylinder intact? Master cylinder might have been installed incorrectly.

Dec 04, 2013 | Cars & Trucks

1 Answer

2001 Silverado 2500 HD Why Rear brakes don't work after I installed new hydro-boost power booster, master cylinder, calipers, and pads. I bled master cylinder before installing, and brakes beginn


Hello Patricia,

Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
been discovered when you had the system bled.

The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide pins...as your calipers are also new that is not your problem.

If your brake pedal feels spongy and travels to the floor board you have air in the system, a brake fluid leak or a failure in the power steering system, such as a broken hose, broken power steering pump drive belt, or failed pump, would result in a loss of pressure to both the hydro-boost and steering.

Find more information here:

. Hydro Boost Power Assist Systems Operation Diagnosis and Repair

Jul 23, 2017 | 2001 Chevrolet Silverado 2500HD

1 Answer

Brakes go to floor i changed master,4 calipers,4 brake hoses, and all pads


Time to redo the bleeding of the system again...starting with the master cylinder...you do not have to remove the master to re-bleed it. disconnect both brake lines from the master, and start again by pushing pedal to floor, and rebleed each line at the master...this is critical to work properly...you mentioned new master cylinder, if remanufactured I would return it. As noted above, after confirming the master is fully bled...rebleed each caliper beginning with the rear, farthest away from the master...you must have "air" in the brake lines. Hope this helps.

Apr 03, 2012 | 1998 Jeep Grand Cherokee

2 Answers

Have no brake pressure, pedal goes straight to floor, put on new calipers and pads and bled the lines but I am no better off.


Sounds like a bad brake booster. To test, pump up the brakes with the engine off. While holding the brake pedal down,start the car. The brake pedal should drop a couple of inches and hold. If it doesn't, replace the booster.

Jul 25, 2011 | 1996 Jeep Grand Cherokee

2 Answers

My 1997 chevy 1500 z71 brakes suddenly going all the way to the floor. Checked brake fluid and it was low. Could be wheel cylinder? Master cylinder? or ?


well, check the brake lines for leakage after adding brake fluid to the full mark. If the brake pedal goes all the way to the floor, it's likely there is a leak somewhere after the master cylinder. If the pedal gets hard after adding fluid, and pumping it several times with the car off, then the master cylinder is still ok.

If air has gotten into the master cylinder, it may have to be bled out on a bench, or using a scanner if that's the way your vehicle is.

Bleeding the Brake System (ABS) Auto Bleed Procedure NOTE: Perform a manual bleeding procedure. If the brake pedal height and firmness results are not achieved, perform the auto bleed procedure below.
NOTE: Perform this procedure when replacing the brake pressure modulator valve or electro-hydraulic control unit.
  1. Perform the manual brake bleeding procedure. Refer to Bleeding the Brake System (non-ABS).
  2. Check the master cylinder fluid level often to prevent running the system dry.
  3. Press the brake pedal firmly and run the Scan Tool Automated Bleed Procedure (for Gas engines) once, or the Function Test (for Diesel engines) four times. Make sure to release the brake pedal between each test.
  4. Perform the manual bleed procedure again. This should remove the remaining air from the brake system.
  5. Bleed the system as many times as needed to obtain the appropriate feel of the brake pedal.

Dec 18, 2010 | 1997 Chevrolet K1500

3 Answers

I have a slow brake fluid loss. I think it may from the master cylinder. Are there any seals in the lines that go into the master cylinder unit.


no they are inverted flare fittings no seals check all lines and calipers/wheel cylinders if all are dry remove the vacuum hose from the booster if there is brake fluid in the hose the master cylinder is bad

Sep 24, 2009 | 2002 Hyundai Santa Fe

2 Answers

Brake pedel pushes to the floor


pump the pedal about 10 times and see if it comes back up, u need to pump the caliper pistons out after a brake job.

Jun 27, 2009 | 1997 Ford F150 Regular Cab

1 Answer

Brakes to the floor(almost) 99 blazer


bleed the brake again. if the pedal goes to the floor with little resistance, then the master cylinder is your problem.
the shim is to depress the noise when you applied the brake. you can skip that, if the brake works without it.

Apr 29, 2009 | 1999 Chevrolet Blazer

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