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RIX97
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« on: May 08, 2022, 02:33:42 PM » |
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I just added new tires, brake pads and brake fluid to my 1998 Valk and was just wondering whether the rear wheel should lock up or not in an emergency stop. I always use both front and rear brakes when stopping but I wanted to test and see whether I still have some air in my brake lines so I've been trying to lock up the rear wheel but I can't. When practicing panic stops with full application of front and rear it stops on a dime. Is it normal for the rear wheel not to lock up?
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Willow
Administrator
Member
Posts: 16601
Excessive comfort breeds weakness. PttP
Olathe, KS
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« Reply #1 on: May 08, 2022, 02:42:58 PM » |
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Depending some on the tire you're running, yes, the rear brake should lock the wheel.
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Chrisj CMA
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« Reply #2 on: May 08, 2022, 03:19:26 PM » |
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It can be hard to get air out if the line for the rear brake. If it feels even a little spongy it’s probably air. I would find a way to depress the brake pedal hard overnight. I did that with the rear brake once, it felt a little spongy and the next day it was rock solid
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« Last Edit: May 08, 2022, 03:27:03 PM by Chrisj CMA »
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RIX97
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« Reply #3 on: May 08, 2022, 04:00:17 PM » |
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I bought a brake bleeding kit off of Amazon and their adapters that go onto the brake bleeder valve were too big so I just put the house directly onto the valve and tightened a small zip tie to hold it in place but I couldn't get the hose tight enough so it was allowing air to get in.
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Chrisj CMA
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« Reply #4 on: May 08, 2022, 04:08:53 PM » |
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I bought a brake bleeding kit off of Amazon and their adapters that go onto the brake bleeder valve were too big so I just put the house directly onto the valve and tightened a small zip tie to hold it in place but I couldn't get the hose tight enough so it was allowing air to get in.
Try bleeding the old fashioned way first then. Press the pedal open and close the bleed then release pedal. Repeat several times |
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F6Dave
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« Reply #5 on: May 08, 2022, 04:23:04 PM » |
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The pivot for the brake pedal gets corroded sometimes and binds up enough to make it difficult to lock the rear brake. You might want to take a look.
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sandy
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« Reply #6 on: May 08, 2022, 05:20:42 PM » |
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Are you pulling the clutch lever? It won’t lock if the engine is in play.
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cookiedough
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« Reply #7 on: May 08, 2022, 05:31:15 PM » |
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I did not think my rear brake pedal would lock the rear tire up since never pressed it that hard but ONLY ONCE in a panic stop deer in front. I skidded the rear tire locking it up for a split second doing about 60 mph was a PUNKER moment for sure, let go off the rear brake bike squared straight again ASAP.
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Patrick
Member
Posts: 15433
VRCC 4474
Largo Florida
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« Reply #8 on: May 08, 2022, 05:36:53 PM » |
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How did you replace the brake fluid ? If you removed fluid from the master cylinder and uncovered the inlet port then there is now air in the system which needs to be removed.
Apply pressure to the pedal and hold while opening the bleeder screw. When the pedal goes down close the bleeder and repeat. Don't let the master go empty or you'll have to start over. Keep bleeding until all the air is out.
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Jess from VA
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« Reply #9 on: May 08, 2022, 05:42:33 PM » |
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I've locked up bike and car tire rears, but I have to really stomp the pedal. And I almost never do that.
Only done it to avoid immediate impact (from the side, not ahead where I can see).
And it's a mistake, as a sliding tire is not stopping as well as a hard braked but not sliding tire.
It's good advice to clean up the rear brake pedal pivot, it gets crummy over time and does impair function.
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« Last Edit: May 08, 2022, 06:24:25 PM by Jess from VA »
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Robert
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« Reply #10 on: May 09, 2022, 05:48:37 AM » |
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In addition to all above sometimes brake pads can be the culprit either from dirt, grease or worn. New brake pads require a break in period also so be patient. The only time brakes will be good on initial install is if new rotors are installed or the surface is perfect on old rotors. Brake pad material plays a big part in the stopping power of brakes also.
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« Last Edit: May 09, 2022, 05:50:43 AM by Robert »
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“Some people see things that are and ask, Why? Some people dream of things that never were and ask, Why not? Some people have to go to work and don’t have time for all that.”
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f6john
Member
Posts: 9339
Christ first and always
Richmond, Kentucky
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« Reply #11 on: May 09, 2022, 05:58:21 AM » |
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My short answer is yes it should be able to lock up the rear wheel.
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Ramie
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« Reply #12 on: May 09, 2022, 08:51:07 AM » |
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I've had to lock up the rear a couple of times, it wasn't fun. I've tried when not in emergency stop mode and it's hard to do unless the adrenaline is flowing.
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“I am not a courageous person by nature. I have simply discovered that, at certain key moments in this life, you must find courage in yourself, in order to move forward and live. It is like a muscle and it must be exercised, first a little, and then more and more. A deep breath and a leap.”
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Grandpot
Member
Posts: 630
Rolling Thunder South Carolina Chapter 1
Fort Mill, South Carolina
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« Reply #13 on: May 09, 2022, 10:02:29 AM » |
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It takes a lot of pressure to lock up the rear if you are applying the rear brake only. If you also apply the front brake, the weight shifts to the front and relieves the weight on the rear tire, thereby making it much more likely to lock up.
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 Experience is recognizing the same mistake every time you make it. |
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