This Toyota Rav4 Has a Serious Problem
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Date: 2019-05-28
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Comments and reviews: 9
Randy Udavcak
Ive been a mechanic for over 30 years and I love watching Scottys videos because I always like learning something new. However, I think this video might unintentionally suggest to some people that bleeding brakes isnt necessary and/or that air only gets in brake systems when there is a leak, which is not true. Brake fluid is hydroscopic and absorbs ambient air moisture over a long period of time, which is why some manufacturers still recommend brake fluid flushes as a maintenance item as the car ages. If your pedal is spongy and the fluid is dark, it is absolutely worth flushing the brake fluid before running system scans and other expensive diagnostics. You can do this by bleeding and adding more fluid until it comes out clean at each wheel if you dont have pressure bleeder. I flush brake fluid all the time on older and/or high mileage cars and people cant believe the difference it makes. (One person swore I must have changed all her brakes because she couldnt ever remember it working so well)
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Ive been a mechanic for over 30 years and I love watching Scottys videos because I always like learning something new. However, I think this video might unintentionally suggest to some people that bleeding brakes isnt necessary and/or that air only gets in brake systems when there is a leak, which is not true. Brake fluid is hydroscopic and absorbs ambient air moisture over a long period of time, which is why some manufacturers still recommend brake fluid flushes as a maintenance item as the car ages. If your pedal is spongy and the fluid is dark, it is absolutely worth flushing the brake fluid before running system scans and other expensive diagnostics. You can do this by bleeding and adding more fluid until it comes out clean at each wheel if you dont have pressure bleeder. I flush brake fluid all the time on older and/or high mileage cars and people cant believe the difference it makes. (One person swore I must have changed all her brakes because she couldnt ever remember it working so well)
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Al Grayson
Why do automotive brakes still use a glycol type fluid? Its hygroscopic, that is, water absorbing. If the system isnt perfectly hermetically sealed, water will be absorbed from the air. This lowers the boiling point, making the brake pedal spongy when the calipers get hot, finally causing the loss of all braking. Glycol brake fluid contaminated with water becomes corrosive to metal brake system parts. One company changed over to an oil-type brake fluid in 1967 both in their cars with central hydraulic systems and those with otherwise conventional brakes(Glycol fluids are made from petroleum but are not considered oil-type fluids) Hydraulic oils absorb almost no water. Even if they are left exposed to moist air they absorb no water. They can be formulated with high boiling points and to remain fluid at low temperatures.
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Why do automotive brakes still use a glycol type fluid? Its hygroscopic, that is, water absorbing. If the system isnt perfectly hermetically sealed, water will be absorbed from the air. This lowers the boiling point, making the brake pedal spongy when the calipers get hot, finally causing the loss of all braking. Glycol brake fluid contaminated with water becomes corrosive to metal brake system parts. One company changed over to an oil-type brake fluid in 1967 both in their cars with central hydraulic systems and those with otherwise conventional brakes(Glycol fluids are made from petroleum but are not considered oil-type fluids) Hydraulic oils absorb almost no water. Even if they are left exposed to moist air they absorb no water. They can be formulated with high boiling points and to remain fluid at low temperatures.
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Chef Carvan Backus
I have a question different from the topic in this video. I have a 2015 Chrysler 300S. Now before you and anyone dis my car because of its brand; I want to tell you that I have never had a problem with the car. Im happy with it, but I want to have more fun with it. safely. I want better braking performance on it without the BREMBO, etc. prices. Do I really need to change the whole kit to get a noticeable improvement on the breaking power? If not will you please recommend a choice to make? Whats the better pad material? Do I really need to go 2 pistons or more calipers? What type of rotor is a good decision to improve from OE? Whats a good brand to use? Thanks in advance. Carvan
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I have a question different from the topic in this video. I have a 2015 Chrysler 300S. Now before you and anyone dis my car because of its brand; I want to tell you that I have never had a problem with the car. Im happy with it, but I want to have more fun with it. safely. I want better braking performance on it without the BREMBO, etc. prices. Do I really need to change the whole kit to get a noticeable improvement on the breaking power? If not will you please recommend a choice to make? Whats the better pad material? Do I really need to go 2 pistons or more calipers? What type of rotor is a good decision to improve from OE? Whats a good brand to use? Thanks in advance. Carvan
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Mister S
Scotty knows how to do what most Modern Mechanics cant. Troubleshoot, and in this case, he was doing Exploratory Surgery (replacing his educated guess told him was the problem) the master cylinder. I had a Van brought to me, brakes would create their own pressure and build heat. I took the master cylinder cover off and and had an assistant apply and release brakes. usually you get spray fountain of brake fluid upon release, but I got hardly anything, after doing inspection on other brake parts, replaced Master Cylinder and problem was solved.
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Scotty knows how to do what most Modern Mechanics cant. Troubleshoot, and in this case, he was doing Exploratory Surgery (replacing his educated guess told him was the problem) the master cylinder. I had a Van brought to me, brakes would create their own pressure and build heat. I took the master cylinder cover off and and had an assistant apply and release brakes. usually you get spray fountain of brake fluid upon release, but I got hardly anything, after doing inspection on other brake parts, replaced Master Cylinder and problem was solved.
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TheJackal917
Hey Scotty I cant help it but I feel you never talk about Mitsubishis. Now, I dont know how about USA, but in Europe it once had a lot of ground. Now I about to buy my first car - obviously not new, a used one. So theres a guy who offering 2000 120k automatic Mitsubishi Galant for 850 bucks and the other one who offers 1998 manual 190k miles Camry for 1399 bucks (what a price) Maybe any thoughts? Have you ever had any Mitsubishi experience? Id like, if you can, to hear some of your thoughts on them. Thanks
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Hey Scotty I cant help it but I feel you never talk about Mitsubishis. Now, I dont know how about USA, but in Europe it once had a lot of ground. Now I about to buy my first car - obviously not new, a used one. So theres a guy who offering 2000 120k automatic Mitsubishi Galant for 850 bucks and the other one who offers 1998 manual 190k miles Camry for 1399 bucks (what a price) Maybe any thoughts? Have you ever had any Mitsubishi experience? Id like, if you can, to hear some of your thoughts on them. Thanks
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Allen Hampshire
Hi Scotty, you are the Sensei of the Mechanic world. The Force is strong with you. A line from the movie the Robots, where Rodney Copperbottom, is a fixer upper and an inventor, comes to mind. His classic question to the other robots was, all right, who wants to get fixed? That would be you. I have the same problem on my sons F150. Had considered the master cylinder and always thought that it was very complicated to change. You did it in less than a minute. .: ) God Bless, keith
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Hi Scotty, you are the Sensei of the Mechanic world. The Force is strong with you. A line from the movie the Robots, where Rodney Copperbottom, is a fixer upper and an inventor, comes to mind. His classic question to the other robots was, all right, who wants to get fixed? That would be you. I have the same problem on my sons F150. Had considered the master cylinder and always thought that it was very complicated to change. You did it in less than a minute. .: ) God Bless, keith
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Luke
The sinking brake pedal on a RAV4 that is relatively new is not the master cylinder. The problem is with the ABS pump that is not bleed from the factory. To bleed the ABS module you have to use a ABS scanner (5 min work) or drive the RAV4 on dirt road to activate the ABS pump. After this problem is corrected the brake pedal should be hard and firm with engine off. Two Toyota dealerships told me its a soft pedal design when the car was still on warranty LOLMaster Tech
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The sinking brake pedal on a RAV4 that is relatively new is not the master cylinder. The problem is with the ABS pump that is not bleed from the factory. To bleed the ABS module you have to use a ABS scanner (5 min work) or drive the RAV4 on dirt road to activate the ABS pump. After this problem is corrected the brake pedal should be hard and firm with engine off. Two Toyota dealerships told me its a soft pedal design when the car was still on warranty LOLMaster Tech
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H IH
Thank you Scotty, very insightful and i wish we got someone with your experience here in Saudi Arabia. My question is: SUVs are very popular here in Saudi Arabia, especially Toyota and Lexus (Toyota with a different badge anyway, especially the Lexus LX. The label on the Lexus Lx says that you have to fill it with Gasoline 95 Octane only. Can I use Gasoline 91 Octane for the Lexus engine (Talking about the 5. 7 V8 engine in the 2015 model onwards. Thanks
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Thank you Scotty, very insightful and i wish we got someone with your experience here in Saudi Arabia. My question is: SUVs are very popular here in Saudi Arabia, especially Toyota and Lexus (Toyota with a different badge anyway, especially the Lexus LX. The label on the Lexus Lx says that you have to fill it with Gasoline 95 Octane only. Can I use Gasoline 91 Octane for the Lexus engine (Talking about the 5. 7 V8 engine in the 2015 model onwards. Thanks
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Auto Technician
Hi Scotty Im a young technician and I work at a small shop in Arden NC. I own a 2001 4Runner limited 4x4, my speedometer and odometer quit working a few months back and unfortunately it doesnt just have a simple mechanical speedometer, its all electronic. The code is P0500 which is transmission speed sensor A. I replaced that already and it still doesnt work, do you have any idea what might be wrong and how to fix it?
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Hi Scotty Im a young technician and I work at a small shop in Arden NC. I own a 2001 4Runner limited 4x4, my speedometer and odometer quit working a few months back and unfortunately it doesnt just have a simple mechanical speedometer, its all electronic. The code is P0500 which is transmission speed sensor A. I replaced that already and it still doesnt work, do you have any idea what might be wrong and how to fix it?
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