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  #1  
Old 04-09-2019, 01:55 PM
FNG FNG is offline
 
Join Date: Jan 2019
Location: Southern Ca
Posts: 42
Question Brakes weak

I have an RV-9A with Cleveland brakes. Both linings and rotors were new 25 hours ago when I purchased the aircraft.

The pedals are firm (no air in lines) but the brakes are ineffective. Hardly can hold aircraft at full power, and don?t seem capable of locking the wheel on landing (this may be a good thing).

I thought they would ?break-in? , but not there yet.

Any suggestions? Is this common on RVS? Are the linings maybe glazed?

Thanks

Tom

Dues paid
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  #2  
Old 04-09-2019, 02:05 PM
Aggie78 Aggie78 is offline
 
Join Date: May 2014
Location: New Braunfels, Texas
Posts: 450
Default

Was this procedure done after the install?

https://www.aircraftspruce.com/catal...ingprocess.pdf

If not, I would re-do it...

Ps-do the Organic Linings procedure if you have the standard install...
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RV-7/N75WV
YIO-360-M1B
New Braunfels, Texas (KBAZ)
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  #3  
Old 04-09-2019, 03:15 PM
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airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,592
Default

If you've gotten any brake fluid contamination at all on the pads, the pads are nerfed and will need to be replaced. I did that once...
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2021 dues paid
N16GN flying 900 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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  #4  
Old 04-09-2019, 03:30 PM
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RV6_flyer RV6_flyer is offline
 
Join Date: Jan 2005
Location: NC25
Posts: 3,763
Default

Quote:
Originally Posted by FNG View Post
I have an RV-9A with Cleveland brakes. Both linings and rotors were new 25 hours ago when I purchased the aircraft.

The pedals are firm (no air in lines) but the brakes are ineffective. Hardly can hold aircraft at full power, and don?t seem capable of locking the wheel on landing (this may be a good thing).

I thought they would ?break-in? , but not there yet.

Any suggestions? Is this common on RVS? Are the linings maybe glazed?

Thanks

Tom

Dues paid
My RV-6 with 160 HP and Constant Speed prop will be 22-years old. The brakes are not strong enough to hold the airplane at full power.

I do NOT use the Cleveland recommended procedure for brake break-in. Our light aircraft with lots of power will create too much heat. I typically just taxi the aircraft to run-up using some light braking. I do my runup, fly around the pattern, then when all three wheels are on the ground, use the brakes to stop as fast as I can. I do a hard stop after landing using brakes about once a month to keep the brake pads conditioned.

Why do I not do a fast taxi with the brakes on? One friend almost caught his RV-8 on fire with a brake fluid leak that caught fire. It destroyed his wheel pant but his son was at his hangar, grabbed the fire extinguisher, put the fire out before anything else got damaged.
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Where is N157GS
Building RV-8 S/N: 80012

To most people, the sky is the limit.
To those who love aviation, the sky is home.
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  #5  
Old 04-09-2019, 05:35 PM
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snopercod snopercod is offline
 
Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,122
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Quote:
Originally Posted by RV6_flyer View Post
One friend almost caught his RV-8 on fire with a brake fluid leak that caught fire.
This is why I switched to Royco 782 synthetic brake fluid. It has a higher fire point (490F).
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  #6  
Old 04-09-2019, 11:12 PM
622BH 622BH is offline
 
Join Date: Nov 2011
Location: Albany, OR
Posts: 203
Default 1900 RPM Max

Since brand new (I built it), my RV-9 with Matco breaks has not been able to hold the aircraft above 1900 RPM. If I persist in exceeding 1900, the airplane skids along the pavement.
Didn't take but a couple of times at that to realize I was never going to be able to do a full-power, breaks locked, short-field take off.
But with these planes that's just not a worry - for me at least.
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  #7  
Old 04-09-2019, 11:14 PM
Tracer 10 Tracer 10 is offline
 
Join Date: Mar 2011
Location: Oregon
Posts: 152
Default Breaking in your Brakes.

I agree with Gary.
I have seen a lot damage due to overheating brake disks & linings as well as crystallized O-Rings in the caliper?s & resulting leaks due to heat damage. If your brakes are to powerful you may just end up on your back suspended by your 5 point harness.
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  #8  
Old 04-14-2019, 10:15 PM
FNG FNG is offline
 
Join Date: Jan 2019
Location: Southern Ca
Posts: 42
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Thanks everyone for the good information!

Tom
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  #9  
Old 04-15-2019, 07:08 AM
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blueflyer blueflyer is offline
 
Join Date: Nov 2008
Location: Shreveport, LA
Posts: 1,083
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I would put on new pads and see what that does for you.
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  #10  
Old 10-18-2021, 07:49 PM
TSPARKER99 TSPARKER99 is offline
 
Join Date: Aug 2021
Location: Kaysville
Posts: 2
Default

Quote:
Originally Posted by FNG View Post
I have an RV-9A with Cleveland brakes. Both linings and rotors were new 25 hours ago when I purchased the aircraft.

The pedals are firm (no air in lines) but the brakes are ineffective. Hardly can hold aircraft at full power, and don?t seem capable of locking the wheel on landing (this may be a good thing).

I thought they would ?break-in? , but not there yet.

Any suggestions? Is this common on RVS? Are the linings maybe glazed?

Thanks

Tom

Dues paid
I recently purchased an RV-9A. One of the first things I noticed and continues to bother me is the weak braking, as compared to my Cessna 172. I pulled out the plans tonight to look at the geometry and I can immediately see why they are much weaker than expected. I am going to work on some ideas to improve them. I am surprised after so many iterations of the RV design that they are using such a poor brake and pedal geometry. The RV-12 looks to be even worse.

This is my first post on the forum, so I fully expect to get flamed for this one.
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