1999 VFR Brake question

mickeymike · 10-26-2009, 03:36 PM

I have a 1999 VFR. I replaced the stock brake lines with Galfer stainless lines this weekend, and bled them in the correct order with my MityVac. I have a question regarding the rear brake pedal functioning: When I apply brake pressure to the rear brake pedal, it goes down about 1/2 inch. If I immediately let off the rear brake pedal and apply it again, it only goes down about 1/4 inch. I don't remember it being this way before I re-did the brake lines. Is this correct or is there air in the lines somewhere? I bled the rear lines twice already and still have the same issue; not sure if it is OK or not.

mickeymike · 10-26-2009, 07:31 PM

I think I may have solved the problem. While bleeding the rear lines, I had never "pumped" the left fork caliper master cylinder. I think there was some air in there. After bleeding the entire rear again, the foot pedal is very firm all the time. I didn't see anything in the manual about pumping the left caliper master cylinder, but it seems essential, and I should have thought of it earlier.

RC30guy · 10-31-2009, 01:51 PM

Read your post with interest....Sounds like a bubbble in the rear line or at the proportioning bleeder under the tank.

I have a 1998 and just bled my brakes, Interesting sequence.
Im wondering how an air bubble in the line betweeen the front left brake and proportioning valve would affect your rear pedal.
It would make sense if your Linked braking stopped working that there was an air bubble between the two.
I cant imagine it affecting the rear pedal firmness unless rear pedal pressure back feeds and pressurizes the LBS line.
I dont recall being able to force fluid out of the LBS bleeder at the front Left disc with the rear pedal....Only by raisng the Front left caliper leading me to believe your air bubble is in the rear line.
Does that make sense?

mickeymike · 11-02-2009, 01:05 PM

I only know that once I pumped the master cylinder on the left caliper and bled the brakes again that my problem was gone. I suppose the air could have been anywhere in the lines.

RC30guy · 11-02-2009, 05:15 PM

I would never question a good thing.
It worked...Thats all that matters.

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10-26-2009, 03:36 PM	#1 (permalink)
mickeymike Junior Member Join Date: Jul 2008 Last Online: 11-18-2009 05:26 PM Posts: 7 Thanks: 0 Thanked 0 Times in 0 Posts	1999 VFR Brake question I have a 1999 VFR. I replaced the stock brake lines with Galfer stainless lines this weekend, and bled them in the correct order with my MityVac. I have a question regarding the rear brake pedal functioning: When I apply brake pressure to the rear brake pedal, it goes down about 1/2 inch. If I immediately let off the rear brake pedal and apply it again, it only goes down about 1/4 inch. I don't remember it being this way before I re-did the brake lines. Is this correct or is there air in the lines somewhere? I bled the rear lines twice already and still have the same issue; not sure if it is OK or not.

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10-26-2009, 07:31 PM	#2 (permalink)
mickeymike Junior Member Join Date: Jul 2008 Last Online: 11-18-2009 05:26 PM Posts: 7 Thanks: 0 Thanked 0 Times in 0 Posts	I think I may have solved the problem. While bleeding the rear lines, I had never "pumped" the left fork caliper master cylinder. I think there was some air in there. After bleeding the entire rear again, the foot pedal is very firm all the time. I didn't see anything in the manual about pumping the left caliper master cylinder, but it seems essential, and I should have thought of it earlier.

10-31-2009, 01:51 PM	#3 (permalink)
RC30guy Junior Member Join Date: May 2006 Last Online: 11-02-2009 05:15 PM View my Photo Gallery Posts: 9 Thanks: 0 Thanked 1 Time in 1 Post	Read your post with interest....Sounds like a bubbble in the rear line or at the proportioning bleeder under the tank. I have a 1998 and just bled my brakes, Interesting sequence. Im wondering how an air bubble in the line betweeen the front left brake and proportioning valve would affect your rear pedal. It would make sense if your Linked braking stopped working that there was an air bubble between the two. I cant imagine it affecting the rear pedal firmness unless rear pedal pressure back feeds and pressurizes the LBS line. I dont recall being able to force fluid out of the LBS bleeder at the front Left disc with the rear pedal....Only by raisng the Front left caliper leading me to believe your air bubble is in the rear line. Does that make sense?

11-02-2009, 01:05 PM	#4 (permalink)
mickeymike Junior Member Join Date: Jul 2008 Last Online: 11-18-2009 05:26 PM Posts: 7 Thanks: 0 Thanked 0 Times in 0 Posts	I only know that once I pumped the master cylinder on the left caliper and bled the brakes again that my problem was gone. I suppose the air could have been anywhere in the lines.

11-02-2009, 05:15 PM	#5 (permalink)
RC30guy Junior Member Join Date: May 2006 Last Online: 11-02-2009 05:15 PM View my Photo Gallery Posts: 9 Thanks: 0 Thanked 1 Time in 1 Post	I would never question a good thing. It worked...Thats all that matters.