Brakes wont depress. - Lexus IS Forum
User Tag List

 
LinkBack Thread Tools
post #1 of 5 (permalink) Old 07-26-2014, 03:07 PM Thread Starter
Newbie
 
Join Date: Oct 2013
Location: GTA, Ontario
Posts: 46
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
Brakes wont depress.

Hello,

Just today when I tried to start my car I noticed that I could not depress my brakes. They were fine when I drove the car home yesterday but today when I tried to start it, it would not depress.

The car was sitting in my driveway all night so no one drove it. this is the first time that it has happened.

Please help as I have no idea what happened.

2004 IS300 5-SPD MT LSD 1C0
Kratos is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 07-26-2014, 03:24 PM
Immortal
 
Join Date: Aug 2009
Location: Pittsbugh PA
Posts: 19,540
Mentioned: 8 Post(s)
Tagged: 4 Thread(s)
Quoted: 78 Post(s)
           
Did the pedal work fine once the engine was running and vacuum was accumulated? Not sure if a vacuum leak would cause the brake booster to not work, giving you a hard pedal, but do you notice any lines off the BB? Even if the pedal was pushed with the car off until the pedal got hard as a rock, it should release once the engine is running.

'02 IS300 MSM LSD
jasonm4 is offline  
post #3 of 5 (permalink) Old 07-26-2014, 03:30 PM Thread Starter
Newbie
 
Join Date: Oct 2013
Location: GTA, Ontario
Posts: 46
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
I did not try to start the car as I did not want to mess with nething and got scared lmao....

Usually I my method of starting the car is:

Step on clutch, go to neutral, step on brakes, start car.

Sometimes i will just pull the e-brake instead of pressing the brakes to start.

I read that if u step on the brakes while the car is off u lose the vacuum, would that be the case or would there be more of an underlying issue?

Would this happen everytime i start the car now because like i said above this is the first time.

I dont usually pump by brakes when the engine is off.

2004 IS300 5-SPD MT LSD 1C0
Kratos is offline  
 
post #4 of 5 (permalink) Old 07-26-2014, 04:56 PM
Extremist
 
Join Date: Mar 2013
Posts: 5,245
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 796 Post(s)
           
Quote:
I read that if u step on the brakes while the car is off u lose the vacuum, would that be the case or would there be more of an underlying issue?
Well, yeah but, that's normal. There's no sequence with the brakes and you can push them any time anywhere.

Quote:
I dont usually pump by brakes when the engine is off.
It doesn't matter if you do or don't. You seem to have some pretty wild idea's about how the brakes work. The vaccum just assists pressing the brakes the brakes work whether you have vaccum or not.

If you get in the car and press down hard on the brake pedal, what happens?
Ek9B18 is online now  
post #5 of 5 (permalink) Old 07-26-2014, 08:25 PM
Extremist
 
Join Date: Mar 2013
Posts: 5,245
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 796 Post(s)
           
To explain "vacuum".

When your car is running it's making a vacuum in the intake manifold so, the minute you crank it up, you have your vacuum back. Imagine a closed box with something sucking the air out. That gives you a vacuum. The intake manifold butterfly is mostly closed at idle but, the pistons are still sucking air out of the intake. This makes a vacuum which is routed to the brake booster. It's used by the PCV system too.
Ek9B18 is online now  
Sponsored Links
Advertisement
 
Reply

  Lexus IS Forum > 1st-Gen IS300 > General Discussion

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Lexus IS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself. If your address is invalid, you will likely lose access to the site.

Email Address:
OR

Log-in











Current users viewing this Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Lexus is300 - gauges dont work, car wont start and wont shift into gear :( ekzcon General Discussion 10 09-05-2010 05:30 PM
okay i wont do it again fecund General Discussion 3 03-20-2005 02:03 AM
Car Starts but wont go into drive & gauges wont work Mike 1 General Discussion 13 11-24-2004 10:33 AM
brakes wont stop sqeeking!!!! skatinondaytons Stop, Drop and Roll 6 09-28-2004 07:28 PM
squeaky brakes.... <update: it wasn't the brakes> kraze8 Stop, Drop and Roll 2 07-15-2003 03:11 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome