Do you pinch off the brake lines when turning/pushing caliper piston back in? - Drive Accord Honda Forums

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Old 05-09-2011, 01:54 PM
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Question Do you pinch off the brake lines when turning/pushing caliper piston back in?

This is a long debate that I've seen all over the web. I replaced my rear pads and rotors yesterday following instructions done by Eric the car guy (www.ericthecarguy.com). He insists that the brake lines must be pinched off (vice grip with rubber hoses) with bleeder screw cracked open when turning (rear) or pushing (front) the caliper piston back in. This prevents back flow into the master cylinder passed the seal. Now, I personally had a fuss over this because brake fluid started leaking from the bleeder screw even after I tightened it. I had to make it real tight then it stopped leaking. So on the left rear side, I didn't perform this procedure. I read some comments on the web and some guys insist that a high pressure hydraulic line should never be pinched.

I'm asking if you guys ever do this. I did a few brake pad changes on my old 98 V6 Accord and I never had to do this. If someone here works for Honda, please chime in on this.

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Old 05-09-2011, 02:07 PM
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I have never once pinched a line for a brake job. I have been a home mechanic for ~10 years too. I don't think it is good for the line at all.
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Old 05-09-2011, 02:15 PM
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I've done brakes on my own cars for many years, and never pinched a line, or opened the bleeder bolt, when pushing the piston back in. The level in the resevior just rises, so you don't want it to be full, when you push the piston back in.
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Old 05-09-2011, 02:27 PM
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Don't pinch the lines, you could damage them and if they fail, they'll do it while you're under braking. Some reason never to hang a caliper from the line.

But DO open the bleed valve when pushing the piston back in. The crappiest fluid in your line is in the caliper and you want to avoid pushing that fluid into the ABS system.
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Old 05-09-2011, 02:37 PM
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Quote:
Originally Posted by Kolia View Post
Don't pinch the lines, you could damage them and if they fail, they'll do it while you're under braking. Some reason never to hang a caliper from the line.

But DO open the bleed valve when pushing the piston back in. The crappiest fluid in your line is in the caliper and you want to avoid pushing that fluid into the ABS system.
So I have one guy here says to do it. But without pinching the brake line, you will still have some fluid that back flows. I think it's better off just doing a complete brake system flush.
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Old 05-09-2011, 02:42 PM
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No fluid will back flow unless you push the piston really quickly or keep the bleed valves closed. Gravity and a couple of check valves will help the fluid stay down.

We have to push the pistons in anyway. Otherwise there is no way to be sure an air pocket or old fluid is still in the cavity.
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Old 05-09-2011, 03:00 PM
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Don't pinch the lines. It is not a good idea.
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Old 05-09-2011, 03:06 PM
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Opening the bleed bolt sounds logical, but there's no way I would put a vise-grip on my brake line.
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Old 05-09-2011, 03:28 PM
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Been doing my own brakes since '96 and I've never opened the bleed screw OR pinched the line.
I did have one car I had to open the MC cap to allow the air to back out because the pressure wouldn't allow me to push the piston back in. I believe this is where the whole open the bleed screw thing came from...some mc caps seal so well that opening the bleed screw makes it much easier to push the piston back in. Especially with old rusted iron calipers you used to find on cars built in the 80's
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Old 05-09-2011, 03:54 PM
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Quote:
Originally Posted by BLCKFLSH View Post
Opening the bleed bolt sounds logical, but there's no way I would put a vise-grip on my brake line.
Watch here,

He pinched the rubber brake line with with a vice grip with rubber hoses over the clamps.

I mean, what's the worst that can happen without opening the bleeder screw? I never had a problem without doing this while changing pads.
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Old 05-10-2011, 04:44 AM
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The worst would be to contaminate the ABS/Stability pump and related systems.

Less bad would be overflowing the MC reservoir and spilling paint removing brake fluid in the engine bay.

Openning the bleed valves isn't mandatory. Above all, it speeds up the subsequent bleed process. For a "like new" bleed, the pistons need to be all the way in.

As for pinching the lines, no way i'm ever doing that. I've seen a brake line failure and i'm glad I wasn't in that car when it turned sideway under heavy braking...
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Old 05-10-2011, 06:19 AM
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Quote:
Originally Posted by Kolia View Post
The worst would be to contaminate the ABS/Stability pump and related systems.

Less bad would be overflowing the MC reservoir and spilling paint removing brake fluid in the engine bay.

Openning the bleed valves isn't mandatory. Above all, it speeds up the subsequent bleed process. For a "like new" bleed, the pistons need to be all the way in.

As for pinching the lines, no way i'm ever doing that. I've seen a brake line failure and i'm glad I wasn't in that car when it turned sideway under heavy braking...
Ok, so I'm not calling Eric the guy wrong, but from I've read with most people out there, they refuse to clamp the brake lines. I would agree in this case. Actually, I don't even want to open the bleeder screw anymore because I don't have the means to bleed the brakes with a one man bleeder kit. I will just open the master cylinder cap. I've never had problems in the past anyway.
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Old 05-10-2011, 06:26 AM
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You could at least get rid of most of the old fluid from the caliper.

Just pump the brake pedal slowly afterward and top off the MC reservoir. You'll have done a partial bleed. Don3 let the reservoir empty itself and suc in air !
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Old 05-11-2011, 09:50 PM
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I specifically stopped by Honda today to ask. I spoke to a mechanic and was told that they NEVER open the bleeder screw when pushing the piston back in. So there you go. Honda trained mechanics don't even do this.
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Old 05-12-2011, 06:29 AM
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Of course they won't !

That would be like a free brake fluid service. They'd rather charge u an extra 100$ instead !
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