Raybestos brake pistons questions (1 Viewer)

[NolaGuy1]

Well, during the rebuild of my rear calipers, we found out the piston had some pretty good wear so we decided to replace it. I’m getting a little tight on cash, so I opted to use raybestos pistons instead of oem.. the new one is
1/2 mm longer
Grove is 1 1/2 mm closer to the butt end
1/2 mm wider grove

How much of an issue do you guys think this will cause?

 

[Kernal]

Not a caliper piston expert, but are you using a Raybestos seal (or OEM) and does it fit snugly in the groove? Seems like the other critical dimension would be the OD, is that the same as the OEM piston? Also, is there any pitting of the piston bore?

Does the package indicate where the Raybestos piston was manufactured?

 

[NolaGuy1]

Not a caliper piston expert, but are you using a Raybestos seal (or OEM) and does it fit snugly in the groove? Seems like the other critical dimension would be the OD, is that the same as the OEM piston? Also, is there any pitting of the piston bore?

Does the package indicate where the Raybestos piston was manufactured?

Thanks for the reply. The OD is the same for both, the only difference is length and the grove placement and grove width. I’m using an OEM caliper rebuild kit. I don’t have the packaging handy, so I’m not sure where it was made. I’m tempted to use them, as they should seal up, just don’t want any issues down the rode

 

[Kernal]

One WAG is if the seal doesn't fit snugly in the Raybestos piston it might want to buckle/move in the groove (gland) and then it may not seal well??

Wait for someone who's rebuilt a caliper using aftermarket parts to chime in.

 

[DivByZero]

You should be fine. The longer piston makes no difference. The differences with the width/placement of the channel for the boot look well within tolerance - that rubber boot is pretty forgiving. Make sure you're using a rubber grease around the seal here though as per FSM - it'll create a barrier to stop moisture or dirt getting into the piston. I've got a pretty comprehensive thread on brake system rebuilding you can refer to here:

Full HZJ80 brake system rebuild - booster to rotor

In this thread, I'm going to give a comprehensive summary of the full brake system rebuild I just did on my HZJ80. I'm going to walk through replacing the master cylinder, all the soft lines, front rotors, splitting and fully rebuilding the calipers, and replacing and calibrating the LSPV. Some...

forum.ih8mud.com

 

[smritte]

With the piston being longer, your pretty close max length. With a new rotor and pads, your pushing the piston all the way back for clearance. I just rebuilt my rears and I think I had about 1MM clearance. Worse case is you remove a little friction material.

 

[jonheld]

How much was the Raybestos piston? An OEM rear caliper piston is about $25. 47731-60020.

 

[Malleus]

The best laugh I ever had was listening to two VaTech interns at work talk about replacing pads on their BMW over a weekend. They couldn't get the new pads over the rotor, so they spent hours sanding them thin enough to fit.

 

[Kernal]

Looks like ~$10 for an aftermarket Raybestos rear caliper piston. Often it's cheaper/easier to just get a new caliper compared to buying parts to repair an old one. But then again sometimes money is tight and you do what you can do.

More Information for RAYBESTOS DPS85075

Toyota 1993-2023 Toyota Caliper Piston 47731-60020 | Toyota Parts

Genuine Toyota 1993-2023 Toyota part # 47731-60020 - Caliper Piston. Toyota Online Parts is your choice for Toyota Parts and Toyota accessories. We are a factory authorized Toyota Dealer with Toyota parts and Toyota accessories all at wholesale prices for your Tundra, Tacoma, Camry, Corolla...

toyotaparts.mcgeorgetoyota.com

 

[NolaGuy1]

How much was the Raybestos piston? An OEM rear caliper piston is about $25. 47731-60020.

They were 20 bucks for the two. It wasn’t the money as much as it was the time to get them.

 

[baggar11]

I've replaced the pistons with aftermarket in plenty of calipers on Nissan and Toyota rigs. Never had any issue. I have only used replacement seals from the same company though. I say, rock it.

 

[NolaGuy1]

I've replaced the pistons with aftermarket in plenty of calipers on Nissan and Toyota rigs. Never had any issue. I have only used replacement seals from the same company though. I say, rock it.

We got them together and everything looks good. Gotta replace one more line then bleed the system. Ready to have it back on the road