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  #1  
Old 13th March 2007
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Tyler Tyler is offline
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Default Vented vs. non-vented: differences?

On my 85, I have non-vented front rotors. Am I right in assuming the only difference between the old style non-vented and the old style vented brakes are the rotors themselves and the yoke that slides on the caliper? Does that make sense? Thanks in advance.

-Tyler
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Old 13th March 2007
Dans_t16s Dans_t16s is offline
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IIRC The vented front disc requires the wider yoked sliding caliper ( almost impossible to find now!) AND narrower width disc pads ( also as rare as hens teeth!)

Its just a bolt up and drive job (if you have the parts).


Dan.
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Old 13th March 2007
kemosaabey kemosaabey is offline
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I have the vented discs - I've used standard pads with no problems.

Maybe there was a difference but I guess it's a case of 'one size fits all' these days....
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Old 13th March 2007
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The pads were originally......

made of different compositions, non vented had softer compound while the vented used a slightly harder compound to make up for the reduced depth (thickness) of the pad. I found that the non vented rotors were prone to a 'higher than average' occurance of brake throb or grab/ warpage, however you wish to describe it.
Generally, I found after a hard drive and workout on the brake pedal then applying the handbrake, I would usually begin to notice the brake throb a few days later. That to me was one flaw in the front handbrake arrangement, the front pads, always the hottest, being compressed into the hottest disc where, at the pad/disc contact area, would be the last point to cool down and so create an uneven heat cool cycle across the rotor.

I'm not seeing this occur at the moment with the current car thankfully.
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  #5  
Old 13th March 2007
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I think the handbrake issue is more related to depositing pad on the disc pretty badly in such scenario. After a hard braking you don't even want to stop as the material can "weld" itself to the disc.
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Old 14th December 2013
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Default Vented Rotor Hubs are different from earlier non-vented hubs

Quote:
Originally Posted by Tyler View Post
On my 85, I have non-vented front rotors. Am I right in assuming the only difference between the old style non-vented and the old style vented brakes are the rotors themselves and the yoke that slides on the caliper? Does that make sense? Thanks in advance.

-Tyler
Tyler, I believe the hubs are also different that have the vented rotors.

I needed to change a front wheel bearing on my 86 SPG, that has vented rotors. I had a disassembled hub from an 85, that had non-vented rotors, that I installed the new wheel bearing in to save some time pressing the bearing out of the one on the SPG.
I bolted up the upper and lower ball joints and the tie rod and tightened the axle nut. When I attempted to install the vented rotor it contacted the lower ball joint.
I pressed the bearing out of the SPG hub and replaced the bearing. I removed the 85 assembly and re-installed the 86 SPG assembly and the vented rotor fit without contacting the lower ball joint.
Jon
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